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I now have comprehensive data from authoritative biochemistry and clinical textbooks. Here is the full explanation for all 26 major cases:

List of Major Cases - Lab Values & Interpretations

GROUP 1: Glucose Tolerance Test (GTT) Cases (1-7)

The Oral GTT involves measuring plasma glucose fasting, then at 1h, 2h (and sometimes 3h) after a 75g oral glucose load (or 100g in gestational diabetes screening).

1. Normal GTT

Time Point	Plasma Glucose
Fasting	< 100 mg/dL (< 5.6 mmol/L)
1 hour	< 180 mg/dL
2 hours	< 140 mg/dL (< 7.8 mmol/L)

Interpretation: Blood glucose rises after glucose load and returns to fasting within 2 hours. Normal beta-cell insulin secretion and peripheral tissue sensitivity. Urine: No glucose (glycosuria absent) because plasma stays below the renal threshold of ~180 mg/dL.

2. Type II Diabetes Mellitus

Time Point	Plasma Glucose
Fasting	≥ 126 mg/dL (≥ 7.0 mmol/L)
2 hours	≥ 200 mg/dL (≥ 11.1 mmol/L)

Interpretation: Fasting hyperglycemia + failure of glucose to return to normal at 2h. Caused by insulin resistance with relative insulin deficiency. Urine: Glycosuria present (plasma glucose exceeds renal threshold). Other markers: HbA1c ≥ 6.5%.

(Harrison's Principles of Internal Medicine 22E, Table 415-2)

3. Renal Glycosuria

Test	Result
Blood glucose (fasting)	Normal (< 100 mg/dL)
Oral GTT curve	Normal (glucose returns to baseline in 2h)
Urine glucose	Positive (glycosuria present)
Urine ketones	Absent

Interpretation: Glucose appears in urine despite normal blood glucose levels. Cause: defective tubular reabsorption of glucose (low renal threshold or reduced Tmax for glucose). The SGLT2 transporter is dysfunctional. GTT curve is entirely normal - the problem is renal, not metabolic. No treatment needed, just reassurance.

(Guyton & Hall Medical Physiology; Smith & Tanagho's General Urology)

4. Abnormal GTT - DM

Time Point	Result
Fasting	≥ 126 mg/dL
1h	> 200 mg/dL
2h	≥ 200 mg/dL

Interpretation: Diagnostically confirming Diabetes Mellitus. The glucose curve shows high fasting, exaggerated peak, and sustained elevation at 2h without returning to normal. Confirms impaired insulin release and/or peripheral insulin resistance.

5. GTT Graph - Normal

The normal GTT graph shows:

Fasting glucose: ~80-100 mg/dL
Smooth rise peaking at ~140 mg/dL by 30-60 min
Smooth return below 140 mg/dL at 2h
No hypoglycemic dip

6. GTT Graph - Type II Diabetes Mellitus

The diabetic GTT graph shows:

Elevated fasting baseline (≥ 126 mg/dL)
Exaggerated peak (> 200 mg/dL)
Sustained elevation at 2h (≥ 200 mg/dL)
Curve fails to return to normal

7. GTT Graph - Renal Glycosuria

The renal glycosuria GTT graph shows:

Blood glucose curve: identical to Normal GTT (normal fasting, normal peak, normal 2h return)
Urine glucose: positive at one or more time points despite normal blood glucose
The discordance between blood and urine glucose is the diagnostic feature

GROUP 2: Ketosis & Acid-Base Disorders (8-14)

8. Starvation Ketosis

Parameter	Result
Blood glucose	Low-normal (60-80 mg/dL)
Serum ketones	Mildly elevated (β-hydroxybutyrate + acetoacetate)
Urine ketones	Positive
Anion gap	Mildly elevated (mild anion gap metabolic acidosis)
pH	Normal to slightly decreased (7.35-7.4)
HCO₃⁻	Slightly decreased
Insulin	Very low
Glucagon	Elevated

Interpretation: Prolonged fasting → relative insulin deficiency → increased lipolysis → fatty acid oxidation → ketone body synthesis (acetoacetate, β-hydroxybutyrate, acetone). Mild, self-limiting. No significant hyperglycemia. Differentiating from DKA: no hyperglycemia, no severe acidosis.

(Comprehensive Clinical Nephrology 7e; Harriet Lane Handbook)

9. Diabetic Ketoacidosis (DKA)

Parameter	Result
Blood glucose	> 250 mg/dL (often > 400 mg/dL)
pH	< 7.30 (severe: < 7.1)
HCO₃⁻	< 18 mEq/L (severe: < 10)
pCO₂	Low (compensatory respiratory alkalosis / Kussmaul breathing)
Anion gap	High (> 12 mEq/L)
Serum ketones	Strongly positive
Urine glucose + ketones	Both positive
Serum K⁺	Initially elevated (acidosis shifts K⁺ out of cells), falls with treatment
Serum Na⁺	Low or normal

Interpretation: Absolute insulin deficiency (Type 1 DM, or severe Type 2) → massive ketone production → high anion gap metabolic acidosis + hyperglycemia + ketonemia/ketonuria. Life-threatening. Treatment: IV fluids, insulin infusion, K⁺ replacement.

(National Kidney Foundation Primer; Tintinalli's Emergency Medicine)

10. Normal Acid-Base Status

Parameter	Normal Value
pH	7.35 - 7.45
pCO₂	35 - 45 mmHg
HCO₃⁻	22 - 26 mEq/L
pO₂	80 - 100 mmHg
Base excess	-2 to +2 mEq/L
Anion gap	8-12 mEq/L

Interpretation: All parameters within reference range. Respiratory and metabolic components balanced.

11. Metabolic Acidosis

Parameter	Result
pH	< 7.35
HCO₃⁻	< 22 mEq/L (primary decrease)
pCO₂	Low (compensatory hyperventilation; ΔpCO₂ = ΔHCO₃⁻ × 1.2)
Anion gap	High (DKA, uremia, lactic acidosis) OR Normal (diarrhea, RTA)

Causes (High AG - MUDPILES): Methanol, Uremia, DKA, Propylene glycol, Isoniazid/Iron, Lactic acidosis, Ethylene glycol, Salicylates. Causes (Normal AG): Diarrhea (HCO₃⁻ loss), Renal tubular acidosis, Ureteral diversion.

(Harriet Lane Handbook; Comprehensive Clinical Nephrology 7e)

12. Metabolic Alkalosis

Parameter	Result
pH	> 7.45
HCO₃⁻	> 26 mEq/L (primary increase)
pCO₂	High (compensatory hypoventilation; ΔpCO₂ = ΔHCO₃⁻ × 0.7 ± 5)
Cl⁻	Low (saline-responsive)
K⁺	Often low

Common causes: Vomiting (H⁺/Cl⁻ loss), diuretic use, hyperaldosteronism, excess antacid intake.

(Henry's Clinical Diagnosis; Comprehensive Clinical Nephrology 7e)

13. Respiratory Acidosis

Parameter	Result
pH	< 7.35
pCO₂	> 45 mmHg (primary increase)
HCO₃⁻	Elevated (renal compensation)
Acute compensation	ΔHCO₃⁻ = ΔpCO₂ × 0.07 ± 1.5
Chronic compensation	ΔHCO₃⁻ = ΔpCO₂ × 0.4 ± 3

Causes: Hypoventilation (COPD, sedatives, neuromuscular disease, airway obstruction), CO₂ retention.

(Henry's Clinical Diagnosis and Management by Laboratory Methods)

14. Respiratory Alkalosis

Parameter	Result
pH	> 7.45
pCO₂	< 35 mmHg (primary decrease)
HCO₃⁻	Decreased (renal compensation)
Acute compensation	ΔHCO₃⁻ = ΔpCO₂ × 0.2 ± 2.5
Chronic compensation	ΔHCO₃⁻ = ΔpCO₂ × 0.5 ± 2.5

Causes: Hyperventilation (anxiety/panic, pain, high altitude, fever, salicylate poisoning early phase, mechanical overventilation, hepatic failure).

(Henry's Clinical Diagnosis; Swanson's Family Medicine)

GROUP 3: Nutritional & Protein Disorders (15, 17)

15. Kwashiorkor

Parameter	Result
Serum albumin	Markedly low (< 2.8 g/dL; normal 3.5-5.5 g/dL)
Total protein	Low
Serum glucose	Low-normal
Urine urea	Low (protein catabolism reduced)
Hemoglobin	Low (anemia)
Edema	Present (pitting edema, ascites, "potbelly")
Fatty liver	Elevated liver enzymes, fatty change on biopsy

Interpretation: Protein-deficient but calorie-adequate malnutrition (common in weaned children with carbohydrate-heavy diets). Low albumin → reduced oncotic pressure → edema. Insulin is not suppressed (carbs present), so fat mobilization is limited - fat accumulates in liver. Key feature: edema despite adequate caloric intake.

(Lippincott's Illustrated Biochemistry 8e; Harper's Illustrated Biochemistry)

17. Edema (in context of hypoalbuminemia)

Parameter	Result
Serum albumin	Low (< 3.0 g/dL)
Total protein	Low
Plasma oncotic pressure	Reduced

Interpretation: Low serum albumin (from kwashiorkor, nephrotic syndrome, liver disease) → decreased colloid osmotic pressure → fluid shifts from intravascular to interstitial compartment → peripheral and pulmonary edema.

GROUP 4: Liver Function Tests & Jaundice (16, 18, 19, 20)

16. Normal Liver Function Test (LFT)

Test	Normal Value
Total bilirubin	0.3 - 1.2 mg/dL
Direct (conjugated) bilirubin	0 - 0.3 mg/dL
Indirect (unconjugated) bilirubin	0.2 - 0.8 mg/dL
ALT (SGPT)	7 - 40 U/L
AST (SGOT)	10 - 40 U/L
ALP	44 - 147 U/L
GGT	5 - 40 U/L
Total protein	6.4 - 8.3 g/dL
Albumin	3.5 - 5.5 g/dL
PT/INR	Normal

18. Hemolytic Jaundice (Pre-hepatic)

Parameter	Result
Total bilirubin	Elevated
Indirect (unconjugated) bilirubin	Markedly elevated
Direct (conjugated) bilirubin	Normal/slightly elevated
Urine bilirubin	Absent (unconjugated is not water-soluble)
Urine urobilinogen	Markedly increased
Stool color	Dark (increased stercobilin)
ALT/AST	Normal
Haptoglobin	Low (consumed by free Hb)
LDH	Elevated
Reticulocyte count	Elevated

Cause: Excessive RBC destruction (sickle cell, G6PD deficiency, thalassemia, malaria). Liver is overwhelmed conjugating bilirubin. No bilirubin in urine = "acholuric jaundice."

(Guyton & Hall; Harper's Illustrated Biochemistry; Lippincott's Biochemistry 8e)

19. Obstructive Jaundice (Post-hepatic)

Parameter	Result
Total bilirubin	Elevated
Direct (conjugated) bilirubin	Markedly elevated
Urine bilirubin	Positive (conjugated is water-soluble → dark urine)
Urine urobilinogen	Absent (bile cannot reach gut)
Stool color	Pale/clay-colored (no stercobilin reaching gut)
ALP	Markedly elevated
GGT	Elevated
ALT/AST	Mildly elevated
PT	Prolonged (fat-soluble vitamin K malabsorption)

Cause: Bile duct obstruction (gallstones, carcinoma of pancreatic head, cholangiocarcinoma, strictures).

(Harper's Illustrated Biochemistry; Guyton & Hall)

20. Hepatic Jaundice (Hepatocellular)

Parameter	Result
Total bilirubin	Elevated
Both direct & indirect bilirubin	Elevated (mixed)
ALT/AST	Markedly elevated (hepatocyte destruction)
ALP	Mildly-moderately elevated
Urine bilirubin	Present (conjugated leaks)
Urine urobilinogen	Variable (may be increased early, absent later)
Albumin	Low (chronic liver disease)
PT	Prolonged

Cause: Viral hepatitis (A, B, C), alcoholic liver disease, cirrhosis, drug-induced hepatotoxicity. Key marker: dramatically elevated transaminases (ALT > AST in viral; AST > ALT in alcoholic).

(Tintinalli's Emergency Medicine; Harper's Illustrated Biochemistry)

GROUP 5: Renal Function Tests (21, 22, 23)

21. Normal Renal Function Test

Test	Normal Value
Serum creatinine	0.6 - 1.2 mg/dL (males); 0.5 - 1.1 mg/dL (females)
Blood urea nitrogen (BUN)	7 - 20 mg/dL
BUN:Creatinine ratio	10:1 to 20:1
eGFR	> 90 mL/min/1.73 m²
Urine protein	< 150 mg/day
Urine protein (dipstick)	Negative
Urine RBCs	0-2/hpf
Serum K⁺	3.5 - 5.0 mEq/L
Serum Na⁺	136 - 145 mEq/L
Urine specific gravity	1.010 - 1.030

22. Acute Glomerulonephritis

Parameter	Result
Urine color	Smoky brown / cola-colored ("hematuria")
Urine RBCs	Numerous + RBC casts (pathognomonic)
Urine protein	Moderate proteinuria (1-3 g/day)
Urine WBCs	Present
Serum creatinine	Elevated
BUN	Elevated
eGFR	Reduced
Serum C3 (complement)	Low (consumed in immune complex deposition)
ASLO titer	Elevated (post-streptococcal GN)
BP	Hypertension
Serum albumin	Normal or slightly low
Edema	Periorbital edema (especially morning)

Interpretation: Most commonly post-streptococcal (Group A beta-hemolytic Streptococcus). Immune complex deposition in glomeruli → inflammation → hematuria + proteinuria + reduced GFR + hypertension. The RBC cast in urine is the hallmark.

(Henry's Clinical Diagnosis; Medical Microbiology 9e)

23. Nephrotic Syndrome

Parameter	Result
Urine protein	> 3.5 g/day (massive proteinuria - defining feature)
Serum albumin	< 3.0 g/dL (hypoalbuminemia)
Serum cholesterol	> 200 mg/dL (hyperlipidemia)
Urine lipids	Lipiduria ("oval fat bodies," "Maltese cross" under polarized light)
Edema	Severe (periorbital, peripheral, ascites)
Urine RBCs	Minimal (no hematuria usually)
Urine RBC casts	Absent
Serum creatinine	Normal early; may be elevated later
Complement	Normal (in minimal change disease)

Classic tetrad: Massive proteinuria + Hypoalbuminemia + Edema + Hyperlipidemia.

Mechanism: Disruption of glomerular filtration barrier (podocyte injury) → protein leak → low oncotic pressure → edema. Liver compensates by synthesizing lipoproteins → hyperlipidemia.

(Goldman-Cecil Medicine; Lippincott's Biochemistry 8e)

GROUP 6: Organ-Specific Disease Markers (24, 25, 26)

24. Myocardial Infarction (MI)

Parameter	Result	Time of Rise
Troponin I / Troponin T	Elevated	Rises 3-6h, peaks 12-24h, stays elevated 7-14 days
CK-MB	Elevated	Rises 4-6h, peaks 18-24h, normalizes 48-72h
LDH (LD1 > LD2)	Elevated	Rises 24-48h, peaks 3-6 days
Myoglobin	Elevated early	Rises 1-3h (earliest, but non-specific)
AST	Moderately elevated
WBC	Elevated (inflammatory response)
ESR	Elevated
ECG	ST elevation (STEMI) or ST depression (NSTEMI)

Interpretation: Death of myocardial tissue releases intracellular enzymes. Troponin is the gold standard - most sensitive and specific. CK-MB used for reinfarction detection (normalizes faster).

(Fishman's Pulmonary Diseases; Neuroanatomy Through Clinical Cases)

25. Hypothyroidism

Parameter	Result
TSH	Markedly elevated (primary hypothyroidism)
Free T4 (FT4)	Low
Free T3	Low
Total T4	Low
Serum cholesterol	Elevated (hypercholesterolemia)
LDL	Elevated
Triglycerides	Elevated
Serum creatinine	May be mildly elevated
CK	May be elevated (myopathy)
Hemoglobin	May be low (anemia)
Serum Na⁺	May be low (SIADH-like)
TSH (secondary hypothyroidism)	Low or normal (pituitary problem)

Interpretation: Elevated TSH is the most sensitive indicator of primary hypothyroidism. The pituitary senses low thyroid hormone and releases more TSH. Low FT4 confirms clinical hypothyroidism. Normal TSH = 0.3-7.5 mIU/L.

(Kaplan & Sadock's Comprehensive Textbook of Psychiatry)

26. Acute Pancreatitis

Parameter	Result
Serum amylase	> 3× upper limit of normal (rises within 2-12h, normalizes 3-5 days)
Serum lipase	> 3× upper limit of normal (more specific; stays elevated longer - up to 14 days)
WBC	Elevated (12,000-20,000/μL)
Serum glucose	Elevated (glucagon release, reduced insulin)
Serum calcium	Low (saponification of fat; hypocalcemia is a poor prognostic sign)
Serum LDH	Elevated
ALT	Elevated (if gallstone-related)
Urine amylase	Elevated
Hematocrit	Elevated (hemoconcentration)
BUN	Elevated (pre-renal)
Serum triglycerides	May be elevated (cause or effect)

Diagnosis requires 2 of 3: (1) Characteristic abdominal pain, (2) Lipase or amylase > 3× normal, (3) Imaging findings.

Severity markers (Ranson's criteria): glucose > 200, LDH > 350, AST > 250, WBC > 16,000, age > 55 on admission.

(Rosen's Emergency Medicine; Yamada's Textbook of Gastroenterology)

Quick Summary Table

#	Case	Key Diagnostic Feature
1	Normal GTT	Fasting < 100, 2h < 140 mg/dL
2	Type II DM	Fasting ≥ 126, 2h ≥ 200 mg/dL
3	Renal glycosuria	Normal blood glucose + urine glucose positive
4	Abnormal GTT-DM	High fasting, exaggerated peak, sustained 2h
5-7	GTT Graphs	Curve shapes distinguishing normal/DM/renal
8	Starvation ketosis	Mild ketonemia, low glucose, no severe acidosis
9	DKA	Glucose > 250, pH < 7.3, high AG, ketonemia
10	Normal acid-base	pH 7.35-7.45, pCO₂ 35-45, HCO₃⁻ 22-26
11	Metabolic acidosis	↓pH, ↓HCO₃⁻, ↓pCO₂ (compensation)
12	Metabolic alkalosis	↑pH, ↑HCO₃⁻, ↑pCO₂ (compensation)
13	Respiratory acidosis	↓pH, ↑pCO₂, ↑HCO₃⁻ (compensation)
14	Respiratory alkalosis	↑pH, ↓pCO₂, ↓HCO₃⁻ (compensation)
15	Kwashiorkor	Very low albumin, edema, fatty liver
16	Normal LFT	All values within normal range
17	Edema	Low albumin → low oncotic pressure
18	Hemolytic jaundice	↑Indirect bilirubin, no urine bilirubin, ↑urobilinogen
19	Obstructive jaundice	↑Direct bilirubin, pale stools, ↑ALP, dark urine
20	Hepatic jaundice	Mixed bilirubin, markedly ↑ALT/AST
21	Normal renal function	Creatinine 0.6-1.2, BUN 7-20, eGFR > 90
22	Acute GN	Hematuria + RBC casts + proteinuria + ↓C3
23	Nephrotic syndrome	> 3.5g/day protein, ↓albumin, ↑cholesterol, edema
24	MI	↑Troponin (gold standard), ↑CK-MB
25	Hypothyroidism	↑TSH, ↓FT4, ↑cholesterol
26	Acute pancreatitis	↑Lipase/Amylase > 3×, ↓Ca²⁺

Sources consulted: Harper's Illustrated Biochemistry 32e, Lippincott's Illustrated Reviews Biochemistry 8e, Harrison's Principles of Internal Medicine 22e, Guyton & Hall Medical Physiology, Henry's Clinical Diagnosis and Management by Laboratory Methods, Comprehensive Clinical Nephrology 7e, Rosen's Emergency Medicine, Yamada's Textbook of Gastroenterology, Medical Microbiology 9e, Kaplan & Sadock's Comprehensive Textbook of Psychiatry.

Finding Sources

Excellent - all 10 DB queries done. Here is the complete explanation for all 19 minor cases:

Minor Cases - Lab Values & Interpretations

GROUP 1: Carbohydrate Metabolism Disorders (1-3)

1. Galactosemia

Deficient enzyme: Galactose-1-phosphate uridyl transferase (GALT) - most common; or Galactokinase (milder variant)

Parameter	Result
Blood galactose	Markedly elevated
Urine reducing substances	Positive (galactose - non-glucose reducing sugar)
Urine glucose (specific)	Negative (reducing substance is galactose, NOT glucose)
Blood glucose	Low (hypoglycemia)
Liver enzymes (ALT, AST)	Elevated (hepatotoxicity from galactose-1-phosphate accumulation)
Bilirubin	Elevated (jaundice)
Coagulation (PT)	Prolonged (liver failure)
Serum albumin	Low
Urine amino acids	Positive (Fanconi syndrome - renal tubular damage)
Newborn screen	Elevated blood galactose-1-phosphate

Clinical: Jaundice, vomiting, cataracts, intellectual disability, E. coli sepsis in neonates after milk feeding. Key: galactose is a reducing sugar - positive Benedict's/Fehling's test but negative glucose oxidase test.

(Robbins & Kumar Pathologic Basis of Disease; Yamada's Gastroenterology; Ganong's Medical Physiology)

2. Hereditary Fructose Intolerance (HFI)

Deficient enzyme: Aldolase B (fructose-1-phosphate aldolase)

Parameter	Result
Blood fructose	Elevated after fructose ingestion
Blood glucose	Markedly low (severe hypoglycemia) after fructose intake
Urine reducing substances	Positive (fructosuria) after fructose ingestion
Liver enzymes (ALT/AST)	Elevated
Serum phosphate	Low (fructose-1-phosphate traps inorganic phosphate)
Uric acid	Elevated (ATP depletion inhibits xanthine oxidase regulation)
Coagulation	Prolonged (liver dysfunction)
Urine amino acids/glucose	Positive (Fanconi syndrome)

Key difference from essential fructosuria (benign): HFI causes severe hypoglycemia and liver/kidney damage. Fructose found in fruits, sucrose, sorbitol. Treatment: strict fructose/sucrose/sorbitol avoidance.

(Harper's Illustrated Biochemistry; Emery's Elements of Medical Genetics)

3. Lactose Intolerance

Deficient enzyme: Lactase (intestinal brush border)

Parameter	Result
Hydrogen breath test	Positive (> 20 ppm rise after lactose load) - gold standard
Lactose tolerance test	Blood glucose rise < 20 mg/dL after 50g lactose (flat curve)
Stool pH	Low (< 5.5) (bacterial fermentation of unabsorbed lactose)
Stool reducing substances	Positive
Urine lactose	May be present (osmotic spillage)
Serum glucose	Flat/minimal rise after lactose challenge
Jejunal biopsy	Absent/markedly reduced lactase enzyme activity

Mechanism: Undigested lactose reaches colon → fermented by bacteria → short-chain fatty acids + H₂ + CO₂ → osmotic diarrhea, bloating, flatulence. Blood tests otherwise normal - this is a functional/enzyme deficiency, not systemic disease.

GROUP 2: Amino Acid Metabolism Disorders (4-5)

4. Phenylketonuria (PKU)

Deficient enzyme: Phenylalanine hydroxylase (PAH) - converts phenylalanine to tyrosine

Parameter	Result
Serum phenylalanine	Markedly elevated (> 20 mg/dL; normal < 2 mg/dL)
Serum tyrosine	Low
Urine phenylpyruvate	Positive (phenylketones)
Urine phenylacetate	Positive
Urine phenyllactate	Positive
FeCl₃ test (urine)	Green color (classic bedside test for phenylpyruvic acid)
Guthrie test (newborn screen)	Elevated blood phenylalanine on filter paper
Urinary phenylpyruvic acid	Musty/mousy odor to urine
Neurotransmitters	Reduced serotonin, dopamine (phenylalanine competes for transport)
Hair/skin pigment	Reduced melanin → fair skin, blue eyes, blonde hair

Treatment: Phenylalanine-restricted diet (low-phenylalanine formula). If untreated: severe intellectual disability, seizures, microcephaly.

(Lippincott's Biochemistry 8e; Tietz Textbook of Laboratory Medicine; Emery's Medical Genetics)

5. Alkaptonuria

Deficient enzyme: Homogentisate oxidase (homogentisic acid accumulates in phenylalanine/tyrosine pathway)

Parameter	Result
Urine homogentisic acid	Markedly elevated (diagnostic)
Urine color	Turns dark brown/black on standing (alkaline conditions or exposure to air)
FeCl₃ test (urine)	Dark color (homogentisic acid)
Urine Benedict's test	Positive (reducing substance)
Serum homogentisic acid	Elevated
Joint X-ray (late)	Ochronotic arthropathy (calcified intervertebral discs)
Sclera/cartilage	Blue-black pigmentation (ochronosis) in adults

Key clinical sign: Dark/black urine that darkens on standing or with alkali exposure - often first noticed in diaper/nappy staining in infants. Generally benign in childhood; ochronosis and arthritis develop in adulthood.

(Lippincott's Biochemistry 8e; Basic Medical Biochemistry 6e)

GROUP 3: Vitamin Deficiency Cases (6-10)

6. Rickets (Vitamin D Deficiency)

Parameter	Result
Serum calcium (Ca²⁺)	Low (hypocalcemia)
Serum phosphate	Low (hypophosphatemia)
Serum ALP	Markedly elevated (increased osteoblast activity)
Serum PTH	Elevated (secondary hyperparathyroidism)
25-OH Vitamin D	Low (< 20 ng/mL = deficiency)
1,25-(OH)₂ Vitamin D	Low
Urine calcium	Low
Urine phosphate	Elevated (PTH effect)
X-ray findings	Widening/fraying of metaphyses, cupping, "rachitic rosary"

Mechanism: Vitamin D deficiency → reduced intestinal Ca & P absorption → low serum Ca → PTH release → phosphaturia → worsened hypophosphatemia → defective bone mineralization → soft bones (rickets in children, osteomalacia in adults).

7. Riboflavin (Vitamin B₂) Deficiency

Parameter	Result
Urine riboflavin	Low (< 30 μg/day)
Erythrocyte glutathione reductase activity coefficient (EGR-AC)	Elevated (> 1.2 = deficiency; gold standard functional test)
Plasma riboflavin	Low (< 3 μg/dL)
Serum FAD (flavin adenine dinucleotide)	Low
CBC	Normocytic anemia (often coexists with iron deficiency)

Clinical signs: Angular cheilitis (cracks at corners of mouth), glossitis (magenta tongue), cheilosis, seborrheic dermatitis, corneal vascularization. Often co-exists with deficiencies of niacin and thiamine.

(Harper's Illustrated Biochemistry; Guyton & Hall Medical Physiology)

8. Pellagra (Niacin/Vitamin B₃ Deficiency)

Parameter	Result
Urine N-methylnicotinamide	Low (< 1.6 mg/day; major excretion product of niacin)
Urine 2-pyridone:N-methylnicotinamide ratio	Altered
Plasma niacin/NAD	Low
Tryptophan levels	Low (tryptophan is a niacin precursor - 60 mg Trp → 1 mg niacin)
Blood count	May show anemia

Classic "4 Ds": Dermatitis (photosensitive, symmetric, Casal's necklace), Diarrhea, Dementia, Death (if untreated). Common in maize-based diets (maize lacks tryptophan + niacin bound as niacytin - unabsorbable). Also seen in carcinoid syndrome (tryptophan diverted), isoniazid therapy.

(Harper's Illustrated Biochemistry 32e)

9. Vitamin B₁₂ Deficiency

Parameter	Result
Serum vitamin B₁₂	Low (< 200 pg/mL; normal 200-900 pg/mL)
MCV	Elevated (> 100 fL) - macrocytosis
Blood smear	Hypersegmented neutrophils (≥ 5 lobes) + macro-ovalocytes
Hemoglobin	Low (megaloblastic anemia)
Serum methylmalonic acid (MMA)	Elevated (specific for B₁₂ deficiency)
Plasma homocysteine	Elevated (elevated in both B₁₂ AND folate deficiency)
Serum folate	Normal (differentiates from folate deficiency)
Intrinsic factor antibodies	Positive in pernicious anemia
Schilling test	Abnormal in pernicious anemia (corrected with IF)
Reticulocyte count	Low (ineffective erythropoiesis)
Serum LDH	Elevated (intramedullary hemolysis)
Serum bilirubin	Mildly elevated

Key: Elevated MMA differentiates B₁₂ deficiency from folate deficiency (folate deficiency has normal MMA). Neurological: subacute combined degeneration of spinal cord (posterior + lateral columns) - unique to B₁₂.

(Harper's Illustrated Biochemistry; Katzung's Pharmacology)

10. Vitamin C Deficiency (Scurvy)

Parameter	Result
Serum/plasma ascorbic acid	Low (< 0.2 mg/dL; normal 0.4-2.0 mg/dL)
Leukocyte ascorbic acid	Low (more sensitive than plasma)
Capillary fragility test	Abnormal (positive Rumpel-Leede test)
Hemoglobin	Low (anemia - iron malabsorption + bleeding)
Prothrombin time	Usually normal
X-ray (children)	Trümmerfeld zone (zone of rarefaction at metaphysis), Pelkan spurs

Clinical: Perifollicular hemorrhages, corkscrew hairs, bleeding gums (gingivitis), poor wound healing, hemarthroses, "scurvy line" on X-ray. Vitamin C required for procollagen hydroxylation (lysyl/prolyl hydroxylase) - deficiency → defective collagen → vascular fragility.

(Yamada's Gastroenterology; Harper's Illustrated Biochemistry)

GROUP 4: Wilson Disease (11)

11. Wilson Disease (Hepatolenticular Degeneration)

Defect: Mutation in ATP7B gene → impaired copper excretion into bile + impaired ceruloplasmin synthesis → copper accumulates in liver, brain, cornea, kidneys.

Parameter	Result
Serum ceruloplasmin	Low (< 20 mg/dL; normal 20-40 mg/dL) - hallmark
24-hr urine copper	Elevated (> 100 μg/day; normal < 40 μg/day)
Serum total copper	Low (most copper normally bound to ceruloplasmin)
Serum free (non-ceruloplasmin) copper	Elevated
Liver copper (biopsy)	> 250 μg/g dry weight (> 4× normal; diagnostic)
Liver enzymes (ALT/AST)	Elevated
Coombs-negative hemolytic anemia	Present (copper-induced RBC lysis)
Kayser-Fleischer rings	Greenish-brown rings in Descemet's membrane of cornea (slit-lamp exam)
Serum uric acid	Low (renal tubular copper damage → Fanconi syndrome)
Urine amino acids/glucose	Positive (Fanconi syndrome)

Scoring (Leipzig criteria): KF rings (2 pts) + neurological symptoms (2 pts) + Coombs-neg hemolytic anemia (1 pt) + low ceruloplasmin (1 pt) + elevated liver Cu (2 pts) + elevated urine Cu (1 pt). Score ≥ 4 = diagnosis.

(Tietz Textbook of Laboratory Medicine; Yamada's Gastroenterology; Kaplan & Sadock's Psychiatry)

GROUP 5: Anemias (12-14)

12. Iron Deficiency Anemia

Parameter	Result
Hemoglobin	Low (< 12 g/dL women; < 13.5 g/dL men)
MCV	Low (< 80 fL) - microcytic
MCH	Low (< 27 pg) - hypochromic
MCHC	Low (< 30%)
Serum iron	Low (< 30 μg/dL)
TIBC (transferrin)	Elevated (> 400 μg/dL)
Transferrin saturation	Low (< 15%)
Serum ferritin	Low (< 12 μg/L) - most sensitive early marker
Reticulocyte count	Low (inadequate production)
Blood smear	Microcytic, hypochromic RBCs, pencil cells, anisocytosis, poikilocytosis
RDW	Elevated (> 14.5%) - anisocytosis
Bone marrow	Absent iron stores (Prussian blue stain negative)

Stages: (1) Iron store depletion (↓ferritin only) → (2) Iron-deficient erythropoiesis (↑TIBC, ↓sat%) → (3) Iron deficiency anemia (↓Hb, ↓MCV).

(Katzung's Pharmacology; Tietz Textbook of Laboratory Medicine; Sleisenger & Fordtran)

13. Sickle Cell Anemia

Defect: Glu → Val substitution at position 6 of β-globin chain → HbS. Homozygous (HbSS) = sickle cell disease.

Parameter	Result
Hemoglobin	Low (6-9 g/dL)
Blood smear	Sickle-shaped RBCs, target cells, Howell-Jolly bodies
Hemoglobin electrophoresis	HbS: 85-95%; HbF: 2-20%; HbA: absent (in HbSS)
Sickle solubility test (Sickledex)	Positive
MCV	Normal (normocytic)
Reticulocyte count	Elevated (5-15%; compensatory)
WBC	Elevated
Bilirubin (indirect)	Elevated (hemolysis)
LDH	Elevated
Haptoglobin	Low
Urine urobilinogen	Elevated
HPLC	Quantifies HbS, HbF, HbA percentages (gold standard)

Sickle cell trait (HbAS): HbA ~60%, HbS ~40%; usually asymptomatic.

(Sabiston Textbook of Surgery; Harrison's Principles of Internal Medicine 22e)

14. Beta-Thalassemia

Defect: Reduced (β⁺) or absent (β⁰) β-globin chain synthesis → relative excess of α chains → precipitation → hemolysis.

Parameter	Beta-thalassemia Major (Cooley's Anemia)	Beta-thalassemia Minor (Trait)
Hemoglobin	Very low (2-7 g/dL)	Mildly low or normal
MCV	Very low (< 70 fL)	Low (60-75 fL)
Blood smear	Microcytic, hypochromic + target cells + nucleated RBCs	Microcytic, hypochromic, target cells
HbA₂ (electrophoresis)	Elevated or variable	Elevated (> 3.5%) - hallmark of trait
HbF	Markedly elevated (> 30%) in major	Normal to slightly elevated
HbA	Absent (β⁰/β⁰) or reduced (β⁺)	Normal
Serum iron	Elevated (hemolysis + transfusions)	Normal
Ferritin	Elevated	Normal
RDW	Elevated	Normal to mildly elevated
Reticulocyte count	Elevated	Normal/mildly elevated

Key differentiator from iron deficiency: In thalassemia, serum ferritin is NORMAL or HIGH (not low); HbA₂ elevated; RDW often less elevated than iron deficiency.

(Creasy & Resnik's Maternal-Fetal Medicine; Tietz Textbook of Laboratory Medicine)

GROUP 6: Acute Gout (15)

15. Acute Gout

Parameter	Result
Serum uric acid	Elevated (> 6.8 mg/dL; typically > 8-10 mg/dL during attack)
Synovial fluid analysis	Negatively birefringent needle-shaped urate crystals (yellow when parallel to compensator axis)
Synovial WBC	10,000-100,000/μL (predominantly neutrophils)
ESR	Elevated
CRP	Elevated
WBC	Elevated
Serum creatinine	May be elevated (urate nephropathy)
24-hr urine uric acid	Elevated (overproducers > 800 mg/day) or normal (underexcreters)
X-ray (chronic gout)	"Punched-out" lytic lesions with overhanging edges; tophi

Mechanism: Hyperuricemia → monosodium urate (MSU) crystal deposition in joints (especially 1st MTP = podagra) → neutrophil phagocytosis → intense acute inflammation. Note: serum uric acid can be normal during an acute attack.

(Goodman & Gilman's Pharmacological Basis of Therapeutics; Rheumatology 2022)

GROUP 7: Serum Protein Electrophoresis (SPE) Patterns (16-19)

Serum protein electrophoresis separates proteins by charge/size into 5 bands: Albumin → α₁ → α₂ → β → γ (globulins)

16. Normal Electrophoretogram

Band	Protein	Normal %	Normal g/dL
Albumin	Albumin	55-65%	3.5-5.0
α₁	α₁-antitrypsin, α₁-acid glycoprotein	2-4%	0.1-0.4
α₂	Haptoglobin, α₂-macroglobulin, ceruloplasmin	6-12%	0.4-0.8
β	Transferrin, C3, fibrinogen (in plasma)	9-15%	0.5-1.0
γ	IgG, IgA, IgM, IgD, IgE	11-21%	0.6-1.6

Pattern: Tall albumin peak is dominant; globulin bands are smaller and progressively decrease toward γ.

(Henry's Clinical Diagnosis and Management by Laboratory Methods)

17. Electrophoretic Pattern - Nephrotic Syndrome

Band	Change	Reason
Albumin	Markedly decreased	Heavy urinary loss (> 3.5 g/day)
α₁ globulin	Decreased	Small proteins lost in urine
α₂ globulin	Markedly increased	α₂-macroglobulin (large, retained) + increased synthesis
β globulin	Increased	Increased lipoprotein synthesis (compensatory)
γ globulin	Decreased	Urinary loss of IgG
Total protein	Low

Characteristic pattern: Low albumin + Low γ + Elevated α₂ (high α₂ is the hallmark). The α₂-macroglobulin is too large to be lost in urine, so it accumulates while smaller proteins are lost.

(Henry's Clinical Diagnosis; Goldman-Cecil Medicine)

18. Electrophoretic Pattern - Cirrhosis of Liver

Band	Change	Reason
Albumin	Decreased	Reduced hepatic synthesis
α₁ globulin	Decreased	Reduced hepatic synthesis
α₂ globulin	Decreased	Reduced hepatic synthesis
β globulin	Slightly increased
γ globulin	Diffusely elevated	Polyclonal increase (reduced hepatic clearance of gut antigens)
β-γ bridging	Present	HALLMARK - IgA merges with β band (β-γ fusion/bridge)

Characteristic pattern: Low albumin + β-γ bridging (β and γ bands merge into one broad band). This β-γ fusion is due to elevated IgA (which migrates in β region) produced in response to portal hypertension and gut bacterial antigens entering circulation.

(Henry's Clinical Diagnosis and Management by Laboratory Methods)

19. Electrophoretic Pattern - Multiple Myeloma

Band	Change	Reason
Albumin	Normal to mildly decreased
α₁, α₂ globulins	Normal or decreased
β globulin	Normal or decreased
γ globulin	Tall, narrow, sharp "M spike" (monoclonal band)	Single clone of plasma cells producing one identical Ig
Total protein	Often elevated

M protein (paraprotein): A single, sharp, narrow band (unlike the broad polyclonal γ seen in infection/cirrhosis). Most commonly IgG (> IgA). Immunofixation electrophoresis (IFE) identifies the specific heavy + light chain type.

Additional lab findings:

Bence-Jones protein in urine (free light chains - κ or λ)
Hypercalcemia (bone destruction)
Elevated creatinine (myeloma kidney)
Rouleaux formation on blood smear
Lytic bone lesions on X-ray ("punched-out" lesions)
Serum β₂-microglobulin elevated (prognosis)

(Robbins & Kumar Pathologic Basis of Disease; Goldman-Cecil Medicine)

Quick Summary Table - All 19 Minor Cases

#	Case	Defect	Single Most Diagnostic Finding
1	Galactosemia	Galactose-1-P uridyl transferase ↓	Urine reducing substance positive (non-glucose) + jaundice
2	Hereditary Fructose Intolerance	Aldolase B ↓	Hypoglycemia + ↓phosphate after fructose
3	Lactose Intolerance	Lactase ↓	Positive H₂ breath test + flat lactose tolerance curve
4	Phenylketonuria	Phenylalanine hydroxylase ↓	↑Serum phenylalanine + green FeCl₃ urine test
5	Alkaptonuria	Homogentisate oxidase ↓	Urine darkens on standing
6	Rickets	Vitamin D deficiency	↓Ca, ↓PO₄, ↑ALP, ↑PTH
7	Riboflavin deficiency	Vitamin B₂ ↓	↑EGR-AC ratio + angular cheilitis
8	Pellagra	Niacin/tryptophan ↓	↓Urine N-methylnicotinamide + "4 Ds"
9	Vitamin B₁₂ deficiency	Cobalamin ↓	↑MCV + hypersegmented neutrophils + ↑MMA
10	Vitamin C deficiency	Ascorbic acid ↓	↓Serum ascorbate + capillary fragility
11	Wilson disease	ATP7B mutation	↓Ceruloplasmin + ↑24h urine copper + KF rings
12	Iron deficiency anemia	Iron ↓	↓Ferritin + ↓MCV + ↑TIBC
13	Sickle cell anemia	HbS (β6 Glu→Val)	HbS on electrophoresis + sickle cells
14	Beta-thalassemia	β-globin synthesis ↓	↑HbA₂ (trait) or ↑HbF (major) + microcytosis
15	Acute gout	Urate crystal deposition	↑Serum uric acid + negatively birefringent crystals
16	Normal electrophoretogram	-	Tall albumin + normal gradual globulin bands
17	Nephrotic syndrome SPE	-	↓Albumin + ↑α₂ + ↓γ
18	Cirrhosis SPE	-	↓Albumin + β-γ bridging
19	Multiple myeloma SPE	-	Sharp "M spike" in γ region

Sources: Robbins & Kumar Pathologic Basis of Disease, Lippincott's Illustrated Reviews Biochemistry 8e, Harper's Illustrated Biochemistry 32e, Tietz Textbook of Laboratory Medicine 7e, Henry's Clinical Diagnosis and Management by Laboratory Methods, Yamada's Gastroenterology 7e, Katzung's Basic & Clinical Pharmacology 16e, Goldman-Cecil Medicine, Emery's Elements of Medical Genetics and Genomics, Harrison's Principles of Internal Medicine 22e.

Create a PDF reference card comparing all 19 minor case labs

Reading File

Running Command

ls /home/daytona/workspace/ 2>/dev/null && mkdir -p /home/daytona/workspace/mino…

Writing File

~/minor-cases-pdf/build_pdf.py

from reportlab.lib.pagesizes import A4, landscape
from reportlab.lib import colors
from reportlab.lib.units import cm, mm
from reportlab.platypus import (
    SimpleDocTemplate, Table, TableStyle, Paragraph, Spacer,
    HRFlowable, KeepTogether
)
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.enums import TA_CENTER, TA_LEFT, TA_RIGHT
from reportlab.platypus import PageBreak

OUTPUT = "/home/daytona/workspace/minor-cases-pdf/Minor_Cases_Reference_Card.pdf"

# ── Colour palette ──────────────────────────────────────────────────────────
DARK_BLUE   = colors.HexColor("#1a3557")
MED_BLUE    = colors.HexColor("#2563a8")
LIGHT_BLUE  = colors.HexColor("#dbeafe")
ACCENT      = colors.HexColor("#0ea5e9")
ROW_ALT     = colors.HexColor("#f0f7ff")
ROW_WHITE   = colors.white
RED_HIGH    = colors.HexColor("#fee2e2")
GREEN_HIGH  = colors.HexColor("#d1fae5")
YELLOW_HIGH = colors.HexColor("#fef9c3")
HEADER_TEXT = colors.white
BODY_TEXT   = colors.HexColor("#1e293b")
GREY_LIGHT  = colors.HexColor("#e2e8f0")
ORANGE      = colors.HexColor("#f97316")

PAGE_W, PAGE_H = landscape(A4)

doc = SimpleDocTemplate(
    OUTPUT,
    pagesize=landscape(A4),
    leftMargin=1.2*cm, rightMargin=1.2*cm,
    topMargin=1.5*cm, bottomMargin=1.5*cm
)

styles = getSampleStyleSheet()

# Custom paragraph styles
title_style = ParagraphStyle(
    "Title", parent=styles["Normal"],
    fontSize=18, fontName="Helvetica-Bold",
    textColor=DARK_BLUE, alignment=TA_CENTER, spaceAfter=2
)
subtitle_style = ParagraphStyle(
    "Subtitle", parent=styles["Normal"],
    fontSize=9, fontName="Helvetica",
    textColor=MED_BLUE, alignment=TA_CENTER, spaceAfter=8
)
section_style = ParagraphStyle(
    "Section", parent=styles["Normal"],
    fontSize=10, fontName="Helvetica-Bold",
    textColor=DARK_BLUE, spaceBefore=6, spaceAfter=3,
    borderPad=3
)
cell_style = ParagraphStyle(
    "Cell", parent=styles["Normal"],
    fontSize=6.8, fontName="Helvetica",
    textColor=BODY_TEXT, leading=9, wordWrap='CJK'
)
cell_bold = ParagraphStyle(
    "CellBold", parent=styles["Normal"],
    fontSize=6.8, fontName="Helvetica-Bold",
    textColor=DARK_BLUE, leading=9
)
cell_red = ParagraphStyle(
    "CellRed", parent=styles["Normal"],
    fontSize=6.8, fontName="Helvetica-Bold",
    textColor=colors.HexColor("#b91c1c"), leading=9
)
header_cell = ParagraphStyle(
    "HeaderCell", parent=styles["Normal"],
    fontSize=7.5, fontName="Helvetica-Bold",
    textColor=HEADER_TEXT, leading=10, alignment=TA_CENTER
)
note_style = ParagraphStyle(
    "Note", parent=styles["Normal"],
    fontSize=6.2, fontName="Helvetica-Oblique",
    textColor=colors.HexColor("#64748b"), leading=8
)

def P(text, style=cell_style):
    return Paragraph(text, style)

def H(text):
    return Paragraph(text, header_cell)

# ── Helper: draw page border & watermark ────────────────────────────────────
def on_page(canvas, doc):
    canvas.saveState()
    # Outer border
    canvas.setStrokeColor(DARK_BLUE)
    canvas.setLineWidth(2)
    canvas.rect(0.6*cm, 0.6*cm, PAGE_W - 1.2*cm, PAGE_H - 1.2*cm)
    # Footer
    canvas.setFont("Helvetica", 6.5)
    canvas.setFillColor(colors.HexColor("#94a3b8"))
    canvas.drawCentredString(PAGE_W/2, 0.85*cm,
        "Minor Cases Reference Card  •  Biochemistry Lab Practical  •  All values are approximate — confirm with local laboratory reference ranges")
    canvas.drawRightString(PAGE_W - 1.3*cm, 0.85*cm, f"Page {doc.page}")
    canvas.restoreState()

# ═══════════════════════════════════════════════════════════════════════════
# DATA
# ═══════════════════════════════════════════════════════════════════════════

# Each case: (no, name, enzyme/defect, key_lab_findings, diagnostic_hallmark, extra_notes)
# key_lab_findings: list of (parameter, result, direction) where direction: "↑","↓","="
# direction used for colour coding

# ── PAGE 1: Carbohydrate & Amino Acid Disorders (Cases 1-5) ─────────────────
cases_p1 = [
    {
        "no": "1", "name": "Galactosemia",
        "defect": "Gal-1-P Uridyl Transferase ↓\n(AR; GALT gene)",
        "findings": [
            ("Blood galactose", "Markedly ↑", "↑"),
            ("Urine reducing substance", "Positive (non-glucose)", "↑"),
            ("Urine glucose (specific)", "Negative", "="),
            ("Blood glucose", "Low (hypoglycemia)", "↓"),
            ("ALT / AST", "Elevated", "↑"),
            ("Bilirubin (total)", "Elevated (jaundice)", "↑"),
            ("Serum albumin", "Low", "↓"),
            ("PT/INR", "Prolonged", "↑"),
            ("Urine amino acids", "Positive (Fanconi)", "↑"),
        ],
        "hallmark": "✦ Urine reduces Benedict's but NOT glucose oxidase strip\n✦ Cataracts + jaundice + E. coli sepsis in neonate",
        "note": "Tx: Remove galactose (lactose-free formula)"
    },
    {
        "no": "2", "name": "Hereditary Fructose Intolerance",
        "defect": "Aldolase B ↓\n(AR; fructose-1-P accumulates)",
        "findings": [
            ("Blood fructose (post-load)", "Elevated", "↑"),
            ("Blood glucose (post-load)", "Severely ↓ (hypoglycemia)", "↓"),
            ("Serum phosphate", "Low (PO₄ trapped)", "↓"),
            ("Serum uric acid", "Elevated", "↑"),
            ("ALT / AST", "Elevated", "↑"),
            ("PT/INR", "Prolonged", "↑"),
            ("Urine reducing substance", "Positive (fructosuria)", "↑"),
            ("Urine amino acids/glucose", "Positive (Fanconi)", "↑"),
        ],
        "hallmark": "✦ Severe hypoglycemia + ↓phosphate after fructose ingestion\n✦ Aversion to sweet foods (protective behavior)",
        "note": "Tx: Strict fructose/sucrose/sorbitol avoidance"
    },
    {
        "no": "3", "name": "Lactose Intolerance",
        "defect": "Lactase ↓\n(intestinal brush border enzyme)",
        "findings": [
            ("H₂ breath test", ">20 ppm rise after lactose load", "↑"),
            ("Lactose tolerance test (blood glucose)", "Rise <20 mg/dL (flat curve)", "↓"),
            ("Stool pH", "<5.5 (acidic, from fermentation)", "↓"),
            ("Stool reducing substances", "Positive", "↑"),
            ("Serum calcium (chronic)", "May be low", "↓"),
            ("Jejunal biopsy lactase", "Absent / markedly reduced", "↓"),
            ("Urine lactose", "May be present", "="),
            ("Routine blood tests", "Generally normal", "="),
        ],
        "hallmark": "✦ H₂ breath test: gold standard\n✦ Flat blood glucose curve after 50g lactose",
        "note": "Tx: Lactose-free diet; lactase enzyme supplements"
    },
    {
        "no": "4", "name": "Phenylketonuria (PKU)",
        "defect": "Phenylalanine hydroxylase ↓\n(AR; Phe → Tyr blocked)",
        "findings": [
            ("Serum phenylalanine", ">20 mg/dL (normal <2)", "↑"),
            ("Serum tyrosine", "Low", "↓"),
            ("Urine phenylpyruvate", "Positive (phenylketones)", "↑"),
            ("FeCl₃ urine test", "Green colour", "↑"),
            ("Guthrie test (newborn)", "Elevated Phe on filter paper", "↑"),
            ("Urine odour", "Musty/mousy", "="),
            ("Melanin / skin pigment", "Reduced (fair skin, blue eyes)", "↓"),
            ("Neurotransmitters (serotonin)", "Reduced", "↓"),
        ],
        "hallmark": "✦ Serum Phe >20 mg/dL + FeCl₃ green test\n✦ Newborn screen: Guthrie (PKU test)",
        "note": "Tx: Low-Phe diet; BH4 (sapropterin) for responsive cases"
    },
    {
        "no": "5", "name": "Alkaptonuria",
        "defect": "Homogentisate oxidase ↓\n(AR; homogentisic acid accumulates)",
        "findings": [
            ("Urine homogentisic acid", "Markedly elevated", "↑"),
            ("Urine colour (on standing)", "Turns dark brown/black", "↑"),
            ("FeCl₃ urine test", "Dark/brown colour", "↑"),
            ("Benedict's test (urine)", "Positive (reducing substance)", "↑"),
            ("Serum homogentisic acid", "Elevated", "↑"),
            ("Joint X-ray (adults)", "Calcified intervertebral discs", "="),
            ("Sclera / cartilage (adults)", "Blue-black pigmentation (ochronosis)", "="),
            ("Routine bloods", "Normal", "="),
        ],
        "hallmark": "✦ URINE DARKENS ON STANDING — pathognomonic\n✦ Dark staining of diapers in infants; ochronosis in adults",
        "note": "Tx: Nitisinone (HPPD inhibitor); high-dose Vit C"
    },
]

# ── PAGE 2: Vitamin Deficiencies (Cases 6-10) ────────────────────────────────
cases_p2 = [
    {
        "no": "6", "name": "Rickets (Vitamin D Deficiency)",
        "defect": "Vitamin D ↓ → impaired Ca²⁺ & PO₄ absorption\n→ defective bone mineralisation",
        "findings": [
            ("Serum calcium", "Low (hypocalcemia)", "↓"),
            ("Serum phosphate", "Low (hypophosphatemia)", "↓"),
            ("Serum ALP", "Markedly elevated (osteoblast activity)", "↑"),
            ("Serum PTH", "Elevated (2° hyperPTH)", "↑"),
            ("25-OH Vitamin D", "<20 ng/mL (deficiency)", "↓"),
            ("1,25-(OH)₂ Vitamin D", "Low", "↓"),
            ("Urine calcium", "Low", "↓"),
            ("Urine phosphate", "Elevated (PTH-mediated)", "↑"),
        ],
        "hallmark": "✦ ↓Ca + ↓PO₄ + ↑ALP + ↑PTH (classic tetrad)\n✦ X-ray: widened metaphyses, cupping, rachitic rosary",
        "note": "Tx: Vitamin D3 + calcium supplementation"
    },
    {
        "no": "7", "name": "Riboflavin (Vit B₂) Deficiency",
        "defect": "Vitamin B₂ ↓ → impaired FAD/FMN cofactors\n→ impaired oxidative metabolism",
        "findings": [
            ("Urine riboflavin", "<30 μg/day (low)", "↓"),
            ("Erythrocyte Glutathione Reductase AC (EGR-AC)", ">1.2 (gold standard)", "↑"),
            ("Plasma riboflavin", "<3 μg/dL", "↓"),
            ("Serum FAD", "Low", "↓"),
            ("Haemoglobin", "Low (normocytic anaemia)", "↓"),
            ("Serum iron", "May be low (co-existing IDA)", "↓"),
            ("Clinical signs", "Angular cheilitis, glossitis, seborrhoea", "="),
            ("Corneal vascularisation", "Present in severe deficiency", "="),
        ],
        "hallmark": "✦ EGR-AC >1.2 = functional B₂ deficiency\n✦ Angular cheilitis + magenta tongue",
        "note": "Often co-exists with niacin/thiamine deficiency"
    },
    {
        "no": "8", "name": "Pellagra (Niacin / Vit B₃ Deficiency)",
        "defect": "Niacin ↓ / Tryptophan ↓ → impaired NAD⁺/NADP⁺\n→ defective energy metabolism",
        "findings": [
            ("Urine N-methylnicotinamide", "<1.6 mg/day (low)", "↓"),
            ("2-Pyridone : N-methylnicotinamide ratio", "<1.0 (altered)", "↓"),
            ("Plasma NAD⁺/NADP⁺", "Low", "↓"),
            ("Serum tryptophan", "Low", "↓"),
            ("Haemoglobin", "Low (anaemia)", "↓"),
            ("Skin biopsy (Casal's necklace)", "Photosensitive dermatitis", "="),
            ("Serum 5-HIAA", "↓ (if carcinoid-related, ↑5-HIAA)", "="),
            ("Routine chemistry", "Otherwise normal", "="),
        ],
        "hallmark": "✦ ↓Urine N-methylnicotinamide is biochemical marker\n✦ Clinical '4 Ds': Dermatitis, Diarrhoea, Dementia, Death",
        "note": "Common in maize-based diets; also with INH therapy"
    },
    {
        "no": "9", "name": "Vitamin B₁₂ Deficiency",
        "defect": "Cobalamin ↓ → impaired DNA synthesis\n→ megaloblastic anaemia + neuropathy",
        "findings": [
            ("Serum Vitamin B₁₂", "<200 pg/mL (normal 200-900)", "↓"),
            ("MCV", ">100 fL (macrocytosis)", "↑"),
            ("Blood smear", "Macro-ovalocytes + hypersegmented neutrophils", "↑"),
            ("Haemoglobin", "Low (megaloblastic anaemia)", "↓"),
            ("Serum methylmalonic acid (MMA)", "Elevated (specific for B₁₂ ↓)", "↑"),
            ("Plasma homocysteine", "Elevated", "↑"),
            ("Serum folate", "Normal (distinguishes from folate deficiency)", "="),
            ("Intrinsic factor antibodies", "Positive (pernicious anaemia)", "↑"),
            ("LDH / indirect bilirubin", "Elevated (ineffective erythropoiesis)", "↑"),
        ],
        "hallmark": "✦ ↑MCV + hyperseg neutrophils + ↑MMA (B₁₂-specific)\n✦ Subacute combined degeneration of spinal cord (unique to B₁₂)",
        "note": "↑MMA differentiates B₁₂ deficiency from folate deficiency"
    },
    {
        "no": "10", "name": "Vitamin C Deficiency (Scurvy)",
        "defect": "Ascorbic acid ↓ → defective collagen synthesis\n(prolyl/lysyl hydroxylase requires Vit C)",
        "findings": [
            ("Serum/plasma ascorbic acid", "<0.2 mg/dL (normal 0.4-2.0)", "↓"),
            ("Leukocyte ascorbic acid", "Low (most sensitive)", "↓"),
            ("Capillary fragility (Rumpel-Leede)", "Abnormal (positive)", "↑"),
            ("Haemoglobin", "Low (anaemia – bleeding + iron malabsorption)", "↓"),
            ("Serum iron", "Low", "↓"),
            ("PT / APTT", "Usually normal", "="),
            ("X-ray (children)", "Trümmerfeld zone + Pelkan spurs at metaphysis", "="),
            ("Clinical", "Perifollicular haemorrhages, bleeding gums, corkscrew hairs", "="),
        ],
        "hallmark": "✦ ↓Plasma ascorbate <0.2 mg/dL + capillary fragility\n✦ Perifollicular haemorrhages + bleeding gums",
        "note": "Tx: Ascorbic acid 300-1000 mg/day; dietary citrus fruits"
    },
]

# ── PAGE 3: Wilson + Anemias + Gout (Cases 11-15) ───────────────────────────
cases_p3 = [
    {
        "no": "11", "name": "Wilson Disease",
        "defect": "ATP7B gene mutation → impaired biliary Cu excretion\n→ Cu accumulates in liver, brain, cornea, kidneys",
        "findings": [
            ("Serum ceruloplasmin", "<20 mg/dL (normal 20-40) — HALLMARK", "↓"),
            ("24-hr urine copper", ">100 μg/day (normal <40)", "↑"),
            ("Serum free (non-cp) copper", "Elevated (>25 μg/dL)", "↑"),
            ("Serum total copper", "Low (less ceruloplasmin-bound Cu)", "↓"),
            ("Liver copper (biopsy)", ">250 μg/g dry weight (diagnostic)", "↑"),
            ("ALT / AST", "Elevated", "↑"),
            ("Coombs-negative haemolytic anaemia", "Present", "↑"),
            ("Kayser-Fleischer rings", "Greenish-brown (slit-lamp)", "="),
            ("Urine amino acids/glucose (Fanconi)", "Positive", "↑"),
        ],
        "hallmark": "✦ ↓Ceruloplasmin + ↑24h urine Cu + KF rings\n✦ Young patient with liver disease + neuropsychiatric features",
        "note": "Tx: D-penicillamine or trientine (chelation); zinc (maintenance)"
    },
    {
        "no": "12", "name": "Iron Deficiency Anaemia",
        "defect": "Iron ↓ → impaired haem synthesis\n→ microcytic hypochromic anaemia",
        "findings": [
            ("Serum ferritin", "<12 μg/L (earliest marker)", "↓"),
            ("Serum iron", "<30 μg/dL", "↓"),
            ("TIBC (transferrin)", ">400 μg/dL", "↑"),
            ("Transferrin saturation", "<15% (= serum Fe ÷ TIBC)", "↓"),
            ("MCV", "<80 fL (microcytic)", "↓"),
            ("MCH", "<27 pg (hypochromic)", "↓"),
            ("MCHC", "<30%", "↓"),
            ("RDW", ">14.5% (anisocytosis)", "↑"),
            ("Blood smear", "Microcytic, hypochromic + pencil cells", "="),
        ],
        "hallmark": "✦ ↓Ferritin (earliest) + ↓MCV + ↑TIBC\n✦ Microcytic hypochromic smear + pencil cells",
        "note": "Stages: 1. ↓Ferritin only → 2. ↑TIBC, ↓Sat% → 3. ↓Hb, ↓MCV"
    },
    {
        "no": "13", "name": "Sickle Cell Anaemia",
        "defect": "HbS: β-globin Glu⁶→Val (point mutation)\nHomozygous HbSS = sickle cell disease",
        "findings": [
            ("Haemoglobin electrophoresis", "HbS 85-95%; HbF 2-20%; HbA absent", "↑"),
            ("Sickle solubility test (Sickledex)", "Positive", "↑"),
            ("HPLC", "Quantifies HbS/HbF/HbA (gold standard)", "="),
            ("Haemoglobin", "6-9 g/dL", "↓"),
            ("Blood smear", "Sickle cells + target cells + Howell-Jolly bodies", "="),
            ("Reticulocyte count", "5-15% (compensatory)", "↑"),
            ("Indirect bilirubin / LDH", "Elevated (haemolysis)", "↑"),
            ("Haptoglobin", "Low (haemolysis marker)", "↓"),
            ("MCV", "Normal (normocytic)", "="),
        ],
        "hallmark": "✦ HbS on electrophoresis + positive sickle test\n✦ HbA absent in HbSS; trait has HbA ~60%, HbS ~40%",
        "note": "Tx: Hydroxyurea (↑HbF); gene therapy now available"
    },
    {
        "no": "14", "name": "Beta-Thalassaemia",
        "defect": "β-globin chain synthesis reduced (β⁺) or absent (β⁰)\n→ α-chain excess → precipitation → haemolysis",
        "findings": [
            ("HbA₂ (electrophoresis)", ">3.5% — HALLMARK of trait (minor)", "↑"),
            ("HbF", ">30% (major); slightly ↑ (minor)", "↑"),
            ("HbA", "Absent (β⁰/β⁰) or reduced (β⁺)", "↓"),
            ("MCV", "<70 fL (very microcytic)", "↓"),
            ("Serum ferritin", "Normal or ↑ (NOT iron deficient)", "="),
            ("Serum iron", "Normal or elevated", "="),
            ("RDW", "Elevated", "↑"),
            ("Blood smear", "Microcytic + target cells + nucleated RBCs (major)", "="),
            ("HPLC", "Quantifies HbA, HbA₂, HbF (gold standard)", "="),
        ],
        "hallmark": "✦ ↑HbA₂ >3.5% = thalassaemia trait (minor)\n✦ Normal/↑ferritin differentiates from iron deficiency",
        "note": "Key: In β-thal, ferritin is NORMAL/HIGH (not low like IDA)"
    },
    {
        "no": "15", "name": "Acute Gout",
        "defect": "Hyperuricaemia → MSU crystal deposition in joints\n→ neutrophil phagocytosis → acute inflammation",
        "findings": [
            ("Serum uric acid", ">6.8 mg/dL (typically >8-10 in attack)", "↑"),
            ("Synovial fluid WBC", "10,000-100,000/μL (predominantly PMNs)", "↑"),
            ("Synovial fluid crystals", "Negatively birefringent needle-shaped urate crystals", "↑"),
            ("ESR / CRP", "Elevated (acute phase)", "↑"),
            ("WBC (serum)", "Elevated", "↑"),
            ("24-hr urine uric acid", ">800 mg/day = overproducer", "↑"),
            ("Serum creatinine", "May be elevated (urate nephropathy)", "↑"),
            ("X-ray (chronic)", "Punched-out lytic lesions + tophi", "="),
        ],
        "hallmark": "✦ Negatively birefringent crystals in synovial fluid = GOLD STANDARD\n✦ Note: serum uric acid may be NORMAL during acute attack",
        "note": "Tx acute: NSAIDs/colchicine/steroids. Chronic: allopurinol/febuxostat"
    },
]

# ── PAGE 4: Serum Protein Electrophoresis (Cases 16-19) ─────────────────────
# We'll do a dedicated SPE comparison table for this page

# ═══════════════════════════════════════════════════════════════════════════
# BUILD FLOWABLES
# ═══════════════════════════════════════════════════════════════════════════

elements = []

def make_title_block(title, subtitle):
    elems = []
    elems.append(Paragraph(title, title_style))
    elems.append(Paragraph(subtitle, subtitle_style))
    elems.append(HRFlowable(width="100%", thickness=2, color=DARK_BLUE, spaceAfter=6))
    return elems

def build_case_table(cases, ncols=5):
    """
    Build a 5-column case table.
    Columns: Case No. | Defect/Enzyme | Key Lab Findings | Diagnostic Hallmark | Treatment Note
    """
    # Header row
    col_headers = ["No / Case", "Enzyme / Defect", "Key Lab Findings", "Diagnostic Hallmark", "Notes / Treatment"]
    col_widths = [2.6*cm, 4.8*cm, 9.0*cm, 6.5*cm, 4.1*cm]

    data = [[H(h) for h in col_headers]]
    row_colors = []

    for i, c in enumerate(cases):
        bg = ROW_ALT if i % 2 == 0 else ROW_WHITE

        # Col 1: Number + Name
        col1 = [Paragraph(f"<b>{c['no']}.</b>", cell_bold),
                Paragraph(c['name'], ParagraphStyle("cn", parent=cell_bold, fontSize=7.2, textColor=MED_BLUE, leading=9))]

        # Col 2: Defect
        col2 = Paragraph(c['defect'], cell_style)

        # Col 3: Lab findings as mini table-like list
        findings_text = ""
        for param, val, direction in c['findings']:
            arrow = ""
            if direction == "↑":
                arrow = '<font color="#b91c1c">▲</font> '
            elif direction == "↓":
                arrow = '<font color="#1d4ed8">▼</font> '
            else:
                arrow = '<font color="#64748b">●</font> '
            findings_text += f"{arrow}<b>{param}:</b> {val}<br/>"
        col3 = Paragraph(findings_text.rstrip("<br/>"), cell_style)

        # Col 4: Hallmark
        col4 = Paragraph(c['hallmark'], ParagraphStyle(
            "hm", parent=cell_style, fontSize=6.8,
            textColor=colors.HexColor("#1e3a5f"), fontName="Helvetica-BoldOblique", leading=9
        ))

        # Col 5: Note
        col5 = Paragraph(c['note'], note_style)

        data.append([[p for p in col1], col2, col3, col4, col5])
        row_colors.append((i + 1, bg))

    t = Table(data, colWidths=col_widths, repeatRows=1)

    style_cmds = [
        ("BACKGROUND", (0, 0), (-1, 0), DARK_BLUE),
        ("TEXTCOLOR",  (0, 0), (-1, 0), HEADER_TEXT),
        ("ALIGN",      (0, 0), (-1, 0), "CENTER"),
        ("VALIGN",     (0, 0), (-1, -1), "TOP"),
        ("FONTNAME",   (0, 0), (-1, 0), "Helvetica-Bold"),
        ("FONTSIZE",   (0, 0), (-1, 0), 7.5),
        ("GRID",       (0, 0), (-1, -1), 0.35, GREY_LIGHT),
        ("LINEBELOW",  (0, 0), (-1, 0), 1.2, ACCENT),
        ("TOPPADDING", (0, 0), (-1, -1), 4),
        ("BOTTOMPADDING", (0, 0), (-1, -1), 4),
        ("LEFTPADDING",  (0, 0), (-1, -1), 4),
        ("RIGHTPADDING", (0, 0), (-1, -1), 4),
        # Alternate row colours
    ]
    for row_idx, bg_col in row_colors:
        style_cmds.append(("BACKGROUND", (0, row_idx), (-1, row_idx), bg_col))

    t.setStyle(TableStyle(style_cmds))
    return t


# ─── PAGE 1 ─────────────────────────────────────────────────────────────────
elements += make_title_block(
    "Minor Cases Reference Card — Biochemistry Lab Practical",
    "Cases 1–5: Carbohydrate & Amino Acid Metabolism Disorders  |  ▲ = Increased  ▼ = Decreased  ● = Special finding"
)
elements.append(build_case_table(cases_p1))
elements.append(PageBreak())

# ─── PAGE 2 ─────────────────────────────────────────────────────────────────
elements += make_title_block(
    "Minor Cases Reference Card — Biochemistry Lab Practical",
    "Cases 6–10: Vitamin Deficiency Disorders  |  ▲ = Increased  ▼ = Decreased  ● = Special finding"
)
elements.append(build_case_table(cases_p2))
elements.append(PageBreak())

# ─── PAGE 3 ─────────────────────────────────────────────────────────────────
elements += make_title_block(
    "Minor Cases Reference Card — Biochemistry Lab Practical",
    "Cases 11–15: Wilson Disease, Anaemias & Acute Gout  |  ▲ = Increased  ▼ = Decreased  ● = Special finding"
)
elements.append(build_case_table(cases_p3))
elements.append(PageBreak())

# ─── PAGE 4: SPE Comparison ─────────────────────────────────────────────────
elements += make_title_block(
    "Minor Cases Reference Card — Biochemistry Lab Practical",
    "Cases 16–19: Serum Protein Electrophoresis (SPE) Patterns Comparison"
)

spe_intro = """
<b>Serum Protein Electrophoresis (SPE)</b> separates serum proteins by charge/size into 5 fractions: 
<b>Albumin → α₁ → α₂ → β → γ</b>.  
Serum total protein normal: <b>6.4–8.3 g/dL</b>. Results interpreted as band height/area on gel or densitometer tracing.
"""
elements.append(Paragraph(spe_intro, ParagraphStyle("intro", parent=cell_style, fontSize=7.5, spaceAfter=6)))

# Main SPE comparison table
spe_headers = ["Band / Fraction", "Normal Values", "Normal SPE\n(Case 16)", "Nephrotic Syndrome\n(Case 17)", "Cirrhosis of Liver\n(Case 18)", "Multiple Myeloma\n(Case 19)"]
spe_col_w   = [3.2*cm, 3.8*cm, 3.8*cm, 4.8*cm, 4.8*cm, 5.0*cm]

def spe_cell(text, bold=False, color=None, bg=None):
    st = ParagraphStyle(
        "sc", parent=cell_style,
        fontName="Helvetica-Bold" if bold else "Helvetica",
        textColor=color or BODY_TEXT,
        fontSize=7.0, leading=9.5
    )
    return Paragraph(text, st)

UP   = '<font color="#b91c1c"><b>▲</b></font>'
DOWN = '<font color="#1d4ed8"><b>▼</b></font>'
NORM = '<font color="#16a34a"><b>◆</b></font>'

spe_data = [
    [H(h) for h in spe_headers],
    [
        spe_cell("Albumin\n(Major band)", bold=True),
        spe_cell("3.5–5.0 g/dL\n55–65%"),
        spe_cell(f"{NORM} Normal\nTall dominant peak", bold=True),
        spe_cell(f"{DOWN} Markedly LOW\nHeavy urinary loss\n(>3.5 g/day proteinuria)", bold=True),
        spe_cell(f"{DOWN} Decreased\nReduced hepatic synthesis"),
        spe_cell(f"{NORM} Normal or\nmildly decreased"),
    ],
    [
        spe_cell("α₁ Globulin\n(α₁-antitrypsin,\nα₁-acid glycoprotein)", bold=True),
        spe_cell("0.1–0.4 g/dL\n2–4%"),
        spe_cell(f"{NORM} Normal small band"),
        spe_cell(f"{DOWN} Decreased\n(lost in urine — small protein)"),
        spe_cell(f"{DOWN} Decreased\n(reduced synthesis)"),
        spe_cell(f"{NORM} Normal or decreased"),
    ],
    [
        spe_cell("α₂ Globulin\n(Haptoglobin,\nα₂-macroglobulin,\nceruloplasmin)", bold=True),
        spe_cell("0.4–0.8 g/dL\n6–12%"),
        spe_cell(f"{NORM} Normal band"),
        spe_cell(f"{UP} <b>MARKEDLY ELEVATED</b>\nα₂-macroglobulin retained\n(too large to lose in urine)\n+ increased synthesis\n★ HALLMARK of nephrotic", bold=True),
        spe_cell(f"{DOWN} Decreased\n(reduced synthesis)"),
        spe_cell(f"{NORM} Normal or decreased"),
    ],
    [
        spe_cell("β Globulin\n(Transferrin,\nComplement C3,\nLDL/VLDL)", bold=True),
        spe_cell("0.5–1.0 g/dL\n9–15%"),
        spe_cell(f"{NORM} Normal band"),
        spe_cell(f"{UP} Increased\n(↑lipoprotein synthesis\n— compensatory for ↓oncotic P)"),
        spe_cell(f"{NORM} Normal to slightly ↑"),
        spe_cell(f"{NORM} Normal or decreased\n(M spike may appear here\nif IgA myeloma)"),
    ],
    [
        spe_cell("γ Globulin\n(IgG, IgA, IgM,\nIgD, IgE)", bold=True),
        spe_cell("0.6–1.6 g/dL\n11–21%"),
        spe_cell(f"{NORM} Normal broad band\n(polyclonal — wide)"),
        spe_cell(f"{DOWN} Decreased\n(IgG lost in urine)"),
        spe_cell(f"{UP} <b>Diffusely elevated</b>\nPolyclonal increase\n(portal HTN → gut Ag leakage)"),
        spe_cell(f"{UP} <b>TALL NARROW M SPIKE</b>\n(monoclonal — sharp peak)\n★ HALLMARK of myeloma", bold=True),
    ],
    [
        spe_cell("Special\nPattern", bold=True),
        spe_cell("—"),
        spe_cell("Normal: Albumin dominant;\ngradual decrease\ntowards γ"),
        spe_cell(f"Pattern:\n{DOWN}Albumin + {DOWN}γ + {UP}α₂\n'Low-Albumin Nephrotic Pattern'"),
        spe_cell(f"Pattern:\n{DOWN}Albumin +\n<b>β-γ BRIDGING</b>\n(β and γ bands merge)\nIgA migrates into β region\n★ HALLMARK of cirrhosis", bold=True),
        spe_cell(f"Pattern:\n<b>Single sharp M spike</b>\nin γ (or β if IgA)\nNarrow monoclonal band\n+ Bence-Jones in urine\n(free light chains)", bold=True),
    ],
    [
        spe_cell("Total Protein", bold=True),
        spe_cell("6.4–8.3 g/dL"),
        spe_cell(f"{NORM} Normal"),
        spe_cell(f"{DOWN} Low (hypoproteinaemia)"),
        spe_cell(f"{DOWN} Low to normal"),
        spe_cell(f"{UP} Often elevated\n(M protein increases total)"),
    ],
    [
        spe_cell("Key Additional\nLab Findings", bold=True),
        spe_cell("—"),
        spe_cell("—"),
        spe_cell("• Proteinuria >3.5 g/day\n• Hyperlipidaemia\n• Lipiduria (oval fat bodies)\n• Oedema"),
        spe_cell("• ↑ALT/AST\n• ↑Bilirubin\n• ↓PT (coagulopathy)\n• ↑NH₃ (if decompensated)\n• Thrombocytopenia"),
        spe_cell("• Bence-Jones protein (urine)\n• Hypercalcaemia\n• ↑Creatinine\n• Lytic bone lesions\n• Rouleaux on smear\n• ↑β₂-microglobulin"),
    ],
]

spe_table = Table(spe_data, colWidths=spe_col_w, repeatRows=1)
spe_style = TableStyle([
    ("BACKGROUND",    (0, 0), (-1, 0), DARK_BLUE),
    ("TEXTCOLOR",     (0, 0), (-1, 0), HEADER_TEXT),
    ("ALIGN",         (0, 0), (-1, 0), "CENTER"),
    ("VALIGN",        (0, 0), (-1, -1), "TOP"),
    ("GRID",          (0, 0), (-1, -1), 0.35, GREY_LIGHT),
    ("LINEBELOW",     (0, 0), (-1, 0), 1.2, ACCENT),
    ("TOPPADDING",    (0, 0), (-1, -1), 4),
    ("BOTTOMPADDING", (0, 0), (-1, -1), 4),
    ("LEFTPADDING",   (0, 0), (-1, -1), 4),
    ("RIGHTPADDING",  (0, 0), (-1, -1), 4),
    # Colour first column
    ("BACKGROUND",    (0, 1), (0, -1), LIGHT_BLUE),
    ("FONTNAME",      (0, 1), (0, -1), "Helvetica-Bold"),
    # Alternate rows 1-8 (data rows)
    ("BACKGROUND",    (1, 2), (-1, 2), ROW_WHITE),
    ("BACKGROUND",    (1, 3), (-1, 3), ROW_ALT),
    ("BACKGROUND",    (1, 4), (-1, 4), ROW_WHITE),
    ("BACKGROUND",    (1, 5), (-1, 5), ROW_ALT),
    ("BACKGROUND",    (1, 6), (-1, 6), ROW_WHITE),
    ("BACKGROUND",    (1, 7), (-1, 7), ROW_ALT),
    ("BACKGROUND",    (1, 8), (-1, 8), ROW_WHITE),
    # Highlight hallmark cells
    ("BACKGROUND",    (3, 3), (3, 3), colors.HexColor("#fef3c7")),   # nephrotic α₂
    ("BACKGROUND",    (4, 6), (4, 6), colors.HexColor("#ecfdf5")),   # cirrhosis β-γ bridge
    ("BACKGROUND",    (5, 5), (5, 5), colors.HexColor("#fef3c7")),   # myeloma M spike
    ("BACKGROUND",    (5, 6), (5, 6), colors.HexColor("#fef3c7")),   # myeloma pattern
])
spe_table.setStyle(spe_style)
elements.append(spe_table)

elements.append(Spacer(1, 0.3*cm))

# Legend
legend_data = [[
    Paragraph('<font color="#b91c1c"><b>▲ Increased</b></font>', cell_style),
    Paragraph('<font color="#1d4ed8"><b>▼ Decreased</b></font>', cell_style),
    Paragraph('<font color="#16a34a"><b>◆ Normal</b></font>', cell_style),
    Paragraph('<b>★ = Hallmark / Pathognomonic finding</b>', cell_style),
    Paragraph('All values approximate — verify with local reference ranges', note_style),
]]
legend_t = Table(legend_data, colWidths=[3*cm, 3*cm, 3*cm, 7*cm, 9*cm])
legend_t.setStyle(TableStyle([
    ("BACKGROUND", (0,0), (-1,-1), colors.HexColor("#f8fafc")),
    ("BOX",        (0,0), (-1,-1), 0.5, GREY_LIGHT),
    ("VALIGN",     (0,0), (-1,-1), "MIDDLE"),
    ("TOPPADDING", (0,0), (-1,-1), 3),
    ("BOTTOMPADDING", (0,0), (-1,-1), 3),
    ("LEFTPADDING", (0,0), (-1,-1), 6),
]))
elements.append(legend_t)

# ─── BUILD ──────────────────────────────────────────────────────────────────
doc.build(elements, onFirstPage=on_page, onLaterPages=on_page)
print(f"PDF created: {OUTPUT}")

Running Command

cd /home/daytona/workspace/minor-cases-pdf && python build_pdf.py 2>&1

Running Command

ls -lh /home/daytona/workspace/minor-cases-pdf/Minor_Cases_Reference_Card.pdf

Your PDF reference card is ready:

Minor Cases Reference Card

PDF Document · PDF

What's inside (4 landscape A4 pages):

Page	Cases	Content
1	1-5	Carbohydrate & Amino Acid Disorders (Galactosemia, HFI, Lactose Intolerance, PKU, Alkaptonuria)
2	6-10	Vitamin Deficiency Disorders (Rickets, Riboflavin, Pellagra, Vit B₁₂, Scurvy)
3	11-15	Wilson Disease, Anaemias & Acute Gout
4	16-19	Full SPE Pattern Comparison Table (Normal vs Nephrotic vs Cirrhosis vs Multiple Myeloma)

Design features:

▲ Red for elevated values, ▼ Blue for decreased values, ◆ Green for normal
Hallmark/pathognomonic findings highlighted in each case
Dedicated SPE page with side-by-side band comparison across all 4 patterns
Treatment/management notes in each row
Page border, alternating row shading, and footer with disclaimer on every page

Create a similar PDF for the 26 Major Cases

Running Command

mkdir -p /home/daytona/workspace/major-cases-pdf

Writing File

~/major-cases-pdf/build_pdf.py

from reportlab.lib.pagesizes import A4, landscape
from reportlab.lib import colors
from reportlab.lib.units import cm
from reportlab.platypus import (
    SimpleDocTemplate, Table, TableStyle, Paragraph, Spacer,
    HRFlowable, PageBreak
)
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.enums import TA_CENTER, TA_LEFT

OUTPUT = "/home/daytona/workspace/major-cases-pdf/Major_Cases_Reference_Card.pdf"

# ── Colour palette ────────────────────────────────────────────────────────
DARK_BLUE   = colors.HexColor("#1a3557")
MED_BLUE    = colors.HexColor("#2563a8")
LIGHT_BLUE  = colors.HexColor("#dbeafe")
ACCENT      = colors.HexColor("#0ea5e9")
ROW_ALT     = colors.HexColor("#f0f7ff")
ROW_WHITE   = colors.white
HEADER_TEXT = colors.white
BODY_TEXT   = colors.HexColor("#1e293b")
GREY_LIGHT  = colors.HexColor("#e2e8f0")

PAGE_W, PAGE_H = landscape(A4)

doc = SimpleDocTemplate(
    OUTPUT,
    pagesize=landscape(A4),
    leftMargin=1.2*cm, rightMargin=1.2*cm,
    topMargin=1.5*cm, bottomMargin=1.5*cm
)

styles = getSampleStyleSheet()

title_style = ParagraphStyle("Title", parent=styles["Normal"],
    fontSize=17, fontName="Helvetica-Bold", textColor=DARK_BLUE,
    alignment=TA_CENTER, spaceAfter=2)
subtitle_style = ParagraphStyle("Subtitle", parent=styles["Normal"],
    fontSize=8.5, fontName="Helvetica", textColor=MED_BLUE,
    alignment=TA_CENTER, spaceAfter=7)
cell_style = ParagraphStyle("Cell", parent=styles["Normal"],
    fontSize=6.6, fontName="Helvetica", textColor=BODY_TEXT, leading=8.8)
cell_bold = ParagraphStyle("CellBold", parent=styles["Normal"],
    fontSize=6.8, fontName="Helvetica-Bold", textColor=DARK_BLUE, leading=9)
cell_blue = ParagraphStyle("CellBlue", parent=styles["Normal"],
    fontSize=7.0, fontName="Helvetica-Bold", textColor=MED_BLUE, leading=9)
cell_hm = ParagraphStyle("CellHm", parent=styles["Normal"],
    fontSize=6.6, fontName="Helvetica-BoldOblique",
    textColor=colors.HexColor("#1e3a5f"), leading=9)
note_style = ParagraphStyle("Note", parent=styles["Normal"],
    fontSize=6.0, fontName="Helvetica-Oblique",
    textColor=colors.HexColor("#64748b"), leading=7.8)
header_cell = ParagraphStyle("HeaderCell", parent=styles["Normal"],
    fontSize=7.5, fontName="Helvetica-Bold", textColor=HEADER_TEXT,
    leading=9.5, alignment=TA_CENTER)

UP   = '<font color="#b91c1c"><b>▲</b></font>'
DOWN = '<font color="#1d4ed8"><b>▼</b></font>'
NORM = '<font color="#16a34a"><b>◆</b></font>'

def P(text, style=cell_style): return Paragraph(text, style)
def H(text): return Paragraph(text, header_cell)

def on_page(canvas, doc):
    canvas.saveState()
    canvas.setStrokeColor(DARK_BLUE)
    canvas.setLineWidth(2)
    canvas.rect(0.6*cm, 0.6*cm, PAGE_W-1.2*cm, PAGE_H-1.2*cm)
    canvas.setFont("Helvetica", 6.3)
    canvas.setFillColor(colors.HexColor("#94a3b8"))
    canvas.drawCentredString(PAGE_W/2, 0.83*cm,
        "Major Cases Reference Card  •  Biochemistry Lab Practical  •  "
        "All values are approximate — confirm with local laboratory reference ranges")
    canvas.drawRightString(PAGE_W-1.3*cm, 0.83*cm, f"Page {doc.page}")
    canvas.restoreState()

def make_title_block(title, subtitle):
    elems = []
    elems.append(Paragraph(title, title_style))
    elems.append(Paragraph(subtitle, subtitle_style))
    elems.append(HRFlowable(width="100%", thickness=2, color=DARK_BLUE, spaceAfter=5))
    return elems

def build_case_table(cases):
    col_headers = ["No / Case", "Pathophysiology", "Key Lab Findings", "Diagnostic Hallmark", "Notes / Treatment"]
    col_widths   = [2.6*cm, 4.6*cm, 9.2*cm, 6.4*cm, 4.2*cm]

    data = [[H(h) for h in col_headers]]
    row_colors = []

    for i, c in enumerate(cases):
        bg = ROW_ALT if i % 2 == 0 else ROW_WHITE

        col1 = [Paragraph(f"<b>{c['no']}.</b>", cell_bold),
                Paragraph(c['name'], cell_blue)]

        col2 = P(c['defect'])

        findings_text = ""
        for param, val, direction in c['findings']:
            if direction == "↑":   arrow = f'{UP} '
            elif direction == "↓": arrow = f'{DOWN} '
            else:                  arrow = f'{NORM} '
            findings_text += f"{arrow}<b>{param}:</b> {val}<br/>"
        col3 = P(findings_text.rstrip("<br/>"))

        col4 = P(c['hallmark'], cell_hm)
        col5 = P(c['note'], note_style)

        data.append([[p for p in col1], col2, col3, col4, col5])
        row_colors.append((i+1, bg))

    t = Table(data, colWidths=col_widths, repeatRows=1)
    style_cmds = [
        ("BACKGROUND",    (0,0), (-1,0), DARK_BLUE),
        ("TEXTCOLOR",     (0,0), (-1,0), HEADER_TEXT),
        ("ALIGN",         (0,0), (-1,0), "CENTER"),
        ("VALIGN",        (0,0), (-1,-1), "TOP"),
        ("GRID",          (0,0), (-1,-1), 0.35, GREY_LIGHT),
        ("LINEBELOW",     (0,0), (-1,0), 1.2, ACCENT),
        ("TOPPADDING",    (0,0), (-1,-1), 3),
        ("BOTTOMPADDING", (0,0), (-1,-1), 3),
        ("LEFTPADDING",   (0,0), (-1,-1), 4),
        ("RIGHTPADDING",  (0,0), (-1,-1), 4),
    ]
    for row_idx, bg_col in row_colors:
        style_cmds.append(("BACKGROUND", (0,row_idx), (-1,row_idx), bg_col))
    t.setStyle(TableStyle(style_cmds))
    return t

# ═══════════════════════════════════════════════════════════════════════════
# CASE DATA
# ═══════════════════════════════════════════════════════════════════════════

# ── PAGE 1: GTT Cases 1–7 ────────────────────────────────────────────────
cases_p1 = [
    {
        "no": "1", "name": "Normal GTT",
        "defect": "Normal glucose homeostasis. Adequate insulin secretion + normal peripheral sensitivity. Renal threshold ~180 mg/dL.",
        "findings": [
            ("Fasting plasma glucose",     "<100 mg/dL (<5.6 mmol/L)", "◆"),
            ("1-hour glucose",             "<180 mg/dL",                "◆"),
            ("2-hour glucose",             "<140 mg/dL (<7.8 mmol/L) — returns to baseline", "◆"),
            ("Urine glucose",              "Negative (below renal threshold)", "◆"),
            ("Urine ketones",              "Negative",                  "◆"),
            ("HbA1c",                      "<5.7%",                     "◆"),
            ("Serum insulin",              "Normal rise then fall",     "◆"),
        ],
        "hallmark": "✦ Smooth bell-curve; 2h glucose <140 mg/dL\n✦ No glucosuria at any time point",
        "note": "Reference standard for diagnosing DM\n75 g oral glucose load (adult)"
    },
    {
        "no": "2", "name": "Type II Diabetes Mellitus",
        "defect": "Insulin resistance + relative insulin deficiency. Beta-cell exhaustion over time. Hepatic glucose overproduction.",
        "findings": [
            ("Fasting plasma glucose",     "≥126 mg/dL (≥7.0 mmol/L)",  "↑"),
            ("2-hour glucose (OGTT)",      "≥200 mg/dL (≥11.1 mmol/L)", "↑"),
            ("Random glucose + symptoms",  "≥200 mg/dL (diagnostic)",    "↑"),
            ("HbA1c",                      "≥6.5% (≥48 mmol/mol)",       "↑"),
            ("Fasting serum insulin",      "Elevated (insulin resistance)", "↑"),
            ("C-peptide",                  "Normal or elevated",          "↑"),
            ("Urine glucose",              "Positive (above renal threshold)", "↑"),
            ("Urine ketones",              "Usually negative / trace",    "◆"),
        ],
        "hallmark": "✦ Elevated fasting + sustained 2h ≥200 mg/dL\n✦ HbA1c ≥6.5% confirms diagnosis",
        "note": "Tx: Metformin first-line; SGLT2i, GLP1-RA, insulin\nScreen: BMI, HTN, dyslipidaemia, family history"
    },
    {
        "no": "3", "name": "Renal Glycosuria",
        "defect": "Defective renal tubular glucose reabsorption (low Tmax or low threshold). SGLT2 transporter dysfunction. Purely renal — not metabolic.",
        "findings": [
            ("Blood glucose (fasting)",    "Normal (<100 mg/dL)",         "◆"),
            ("Oral GTT blood glucose",     "Normal curve (all time points)", "◆"),
            ("Urine glucose",              "POSITIVE despite normal blood glucose", "↑"),
            ("Urine ketones",              "Absent",                       "◆"),
            ("HbA1c",                      "Normal",                       "◆"),
            ("Serum electrolytes",         "Normal",                       "◆"),
            ("Renal function",             "Normal",                       "◆"),
        ],
        "hallmark": "✦ Normal blood glucose + Positive urine glucose\n✦ Normal GTT curve — problem is RENAL, not metabolic",
        "note": "Benign condition; no treatment needed\nReassure patient; distinguish from DM"
    },
    {
        "no": "4", "name": "Abnormal GTT – DM",
        "defect": "Confirms DM via OGTT. Impaired insulin release and/or peripheral resistance causes sustained post-load hyperglycaemia.",
        "findings": [
            ("Fasting glucose",            "≥126 mg/dL",                  "↑"),
            ("1-hour glucose",             ">200 mg/dL (exaggerated peak)", "↑"),
            ("2-hour glucose",             "≥200 mg/dL (fails to normalise)", "↑"),
            ("Urine glucose",              "Positive at multiple time points", "↑"),
            ("HbA1c",                      "≥6.5%",                       "↑"),
            ("Impaired fasting glucose",   "100–125 mg/dL = pre-diabetes", "↑"),
            ("Impaired glucose tolerance", "2h 140–199 mg/dL = pre-diabetes", "↑"),
        ],
        "hallmark": "✦ High fasting + exaggerated peak + 2h ≥200 mg/dL\n✦ Curve stays elevated — no return to baseline",
        "note": "Two abnormal values required for diagnosis\nRepeat testing on separate day if asymptomatic"
    },
    {
        "no": "5", "name": "GTT Graph – Normal",
        "defect": "Graphical representation of normal glucose homeostasis. Smooth rise, peak, and return to baseline within 2 hours.",
        "findings": [
            ("Fasting baseline",           "80–100 mg/dL",                "◆"),
            ("Peak (30-60 min)",           "~120–140 mg/dL",              "◆"),
            ("2-hour value",               "<140 mg/dL",                  "◆"),
            ("Curve shape",                "Smooth bell curve, no prolonged plateau", "◆"),
            ("Urine glucose at all points","Negative",                     "◆"),
            ("Return to baseline",         "Complete by 2 hours",         "◆"),
        ],
        "hallmark": "✦ Smooth symmetric bell curve\n✦ No glucosuria; returns below 140 mg/dL at 2h",
        "note": "Normal: fasting <100 / 1h <180 / 2h <140 mg/dL\nThresholds: ADA 2023 criteria"
    },
    {
        "no": "6", "name": "GTT Graph – Type II DM",
        "defect": "Graphical pattern showing elevated fasting, exaggerated sustained peak, and failure to normalise at 2 hours.",
        "findings": [
            ("Fasting baseline",           "≥126 mg/dL (elevated start)", "↑"),
            ("Peak (60-90 min)",           ">200 mg/dL (exaggerated)",    "↑"),
            ("2-hour value",               "≥200 mg/dL (no return to normal)", "↑"),
            ("Curve shape",                "Flat, prolonged high plateau", "↑"),
            ("Urine glucose",              "Positive at multiple time points", "↑"),
            ("Curve vs normal",            "Shifted upward and rightward", "↑"),
        ],
        "hallmark": "✦ Elevated baseline + sustained plateau >200 mg/dL\n✦ Entire curve sits above normal throughout",
        "note": "Compare directly with Normal GTT curve\nDemonstrates both fasting + post-load hyperglycaemia"
    },
    {
        "no": "7", "name": "GTT Graph – Renal Glycosuria",
        "defect": "Blood glucose curve IDENTICAL to normal GTT. Discordance: urine glucose positive at one or more time points despite normal blood glucose.",
        "findings": [
            ("Blood glucose curve",        "Identical to NORMAL GTT",     "◆"),
            ("Fasting blood glucose",      "Normal (<100 mg/dL)",         "◆"),
            ("2-hour blood glucose",       "Normal (<140 mg/dL)",         "◆"),
            ("Urine glucose (timed)",      "Positive at one or more collections", "↑"),
            ("Urine glucose vs blood",     "Discordant — urine +ve, blood normal", "↑"),
            ("Urine ketones",              "Negative",                     "◆"),
        ],
        "hallmark": "✦ DISCORDANCE: Normal blood curve + Positive urine\n✦ The blood and urine glucose curves do NOT match",
        "note": "Key teaching point: urine glucose ≠ blood glucose\nRenal glycosuria is benign; no treatment"
    },
]

# ── PAGE 2: Ketosis & Acid-Base Cases 8–14 ──────────────────────────────
cases_p2 = [
    {
        "no": "8", "name": "Starvation Ketosis",
        "defect": "Prolonged fasting → relative insulin deficiency → lipolysis ↑ → fatty acid β-oxidation → ketone body synthesis (acetoacetate, β-OHB, acetone). Mild, self-limiting.",
        "findings": [
            ("Blood glucose",              "Low-normal (60–80 mg/dL)",    "↓"),
            ("Serum ketones (β-OHB + AcAc)","Mildly elevated",           "↑"),
            ("Urine ketones",              "Positive",                    "↑"),
            ("Serum pH",                   "Normal to mildly decreased (7.35–7.4)", "◆"),
            ("Serum HCO₃⁻",               "Slightly low (20–22 mEq/L)", "↓"),
            ("Anion gap",                  "Mildly elevated (12–16 mEq/L)", "↑"),
            ("Serum insulin",              "Very low",                    "↓"),
            ("Serum glucagon",             "Elevated",                    "↑"),
        ],
        "hallmark": "✦ Mild ketonemia + mild acidosis + LOW/normal glucose\n✦ No hyperglycaemia distinguishes from DKA",
        "note": "Resolves with glucose intake\nDifferentiate: DKA has glucose >250, pH <7.3"
    },
    {
        "no": "9", "name": "Diabetic Ketoacidosis (DKA)",
        "defect": "Absolute insulin deficiency → massive ketogenesis + hyperglycaemia + osmotic diuresis → high anion gap metabolic acidosis. Life-threatening.",
        "findings": [
            ("Blood glucose",              ">250 mg/dL (often >400)",     "↑"),
            ("Serum pH",                   "<7.30 (severe: <7.10)",       "↓"),
            ("Serum HCO₃⁻",               "<18 mEq/L (severe: <10)",     "↓"),
            ("pCO₂",                       "Low (Kussmaul hyperventilation — compensation)", "↓"),
            ("Anion gap",                  ">12 mEq/L (high AG acidosis)", "↑"),
            ("Serum ketones",              "Strongly positive",            "↑"),
            ("Urine glucose + ketones",    "Both strongly positive",       "↑"),
            ("Serum K⁺",                   "Initially ↑ (acidosis); falls with insulin Tx", "↑"),
            ("Serum Na⁺",                  "Low or normal (dilutional)",   "↓"),
        ],
        "hallmark": "✦ Glucose >250 + pH <7.3 + High AG + Ketonaemia\n✦ Kussmaul breathing + fruity breath (acetone)",
        "note": "Tx: IV fluids, insulin infusion, K⁺ replacement\nMonitor: glucose q1h, K⁺ q2h, pH q4h"
    },
    {
        "no": "10", "name": "Normal Acid-Base Status",
        "defect": "All respiratory and metabolic parameters within normal reference ranges. Lungs regulate pCO₂; kidneys regulate HCO₃⁻.",
        "findings": [
            ("Arterial pH",                "7.35–7.45",                   "◆"),
            ("pCO₂",                       "35–45 mmHg",                  "◆"),
            ("HCO₃⁻",                      "22–26 mEq/L",                 "◆"),
            ("pO₂",                        "80–100 mmHg",                 "◆"),
            ("Base excess (BE)",           "–2 to +2 mEq/L",             "◆"),
            ("Anion gap",                  "8–12 mEq/L",                  "◆"),
            ("SaO₂",                       ">95%",                        "◆"),
            ("SpO₂",                       ">95%",                        "◆"),
        ],
        "hallmark": "✦ pH 7.35–7.45; pCO₂ 35–45; HCO₃⁻ 22–26\n✦ All parameters within reference range",
        "note": "Henderson-Hasselbalch: pH = 6.1 + log([HCO₃⁻]/0.03×pCO₂)\nAG = Na⁺ – (Cl⁻ + HCO₃⁻); normal = 8–12"
    },
    {
        "no": "11", "name": "Metabolic Acidosis",
        "defect": "Primary ↓ HCO₃⁻ → lungs compensate by hyperventilating (↓pCO₂). High-AG: DKA, lactic acidosis, uremia. Normal-AG: diarrhoea, RTA.",
        "findings": [
            ("pH",                         "<7.35",                       "↓"),
            ("HCO₃⁻ (primary change)",     "<22 mEq/L",                  "↓"),
            ("pCO₂ (compensation)",        "Low: ΔpCO₂ = ΔHCO₃⁻ × 1.2", "↓"),
            ("Anion gap (if high-AG)",      ">12 mEq/L",                  "↑"),
            ("Anion gap (if normal-AG)",    "8–12 mEq/L (hyperchloraemic)", "◆"),
            ("Serum Cl⁻ (normal-AG type)", "Elevated (hyperchloraemic)",  "↑"),
            ("Serum K⁺",                   "Often elevated (K⁺ shifts out of cells)", "↑"),
            ("Urine pH (RTA)",             ">5.5 despite acidosis (Type I RTA)", "↑"),
        ],
        "hallmark": "✦ ↓pH + ↓HCO₃⁻ (primary) + ↓pCO₂ (compensation)\n✦ High-AG causes: MUDPILES mnemonic",
        "note": "MUDPILES: Methanol, Uremia, DKA, Propylene glycol,\nIsoniazid/Iron, Lactic acidosis, Ethylene glycol, Salicylates"
    },
    {
        "no": "12", "name": "Metabolic Alkalosis",
        "defect": "Primary ↑ HCO₃⁻ → lungs compensate by hypoventilating (↑pCO₂). Causes: vomiting (H⁺/Cl⁻ loss), diuretics, hyperaldosteronism.",
        "findings": [
            ("pH",                         ">7.45",                       "↑"),
            ("HCO₃⁻ (primary change)",     ">26 mEq/L",                  "↑"),
            ("pCO₂ (compensation)",        "↑: ΔpCO₂ = ΔHCO₃⁻ × 0.7 ± 5", "↑"),
            ("Serum Cl⁻",                  "Low (saline-responsive causes)", "↓"),
            ("Serum K⁺",                   "Low (hypokalaemia — K⁺ enters cells)", "↓"),
            ("Urine Cl⁻",                  "<20 mEq/L (saline-responsive) or >20 (resistant)", "↓"),
            ("Serum Na⁺",                  "Variable",                    "◆"),
            ("Serum albumin",              "Low albumin can mask AG changes", "↓"),
        ],
        "hallmark": "✦ ↑pH + ↑HCO₃⁻ (primary) + ↑pCO₂ (compensation)\n✦ ↓Cl⁻ + ↓K⁺ = vomiting/diuretic pattern",
        "note": "Saline-responsive (urine Cl⁻ <20): vomiting, NG tube\nSaline-resistant (urine Cl⁻ >20): hyperaldosteronism"
    },
    {
        "no": "13", "name": "Respiratory Acidosis",
        "defect": "Primary ↑ pCO₂ (hypoventilation) → kidneys compensate by retaining HCO₃⁻. Causes: COPD, sedatives, neuromuscular disease.",
        "findings": [
            ("pH",                         "<7.35",                       "↓"),
            ("pCO₂ (primary change)",      ">45 mmHg",                   "↑"),
            ("HCO₃⁻ (compensation)",       "Elevated (renal retention)",  "↑"),
            ("Acute compensation",         "ΔHCO₃⁻ = ΔpCO₂ × 0.07 ± 1.5", "◆"),
            ("Chronic compensation",       "ΔHCO₃⁻ = ΔpCO₂ × 0.4 ± 3",  "◆"),
            ("Serum K⁺",                   "Mildly elevated",             "↑"),
            ("pO₂",                        "Low (if lung disease)",        "↓"),
            ("SaO₂",                       "Decreased",                   "↓"),
        ],
        "hallmark": "✦ ↓pH + ↑pCO₂ (primary) + ↑HCO₃⁻ (compensation)\n✦ Acute: minimal HCO₃⁻ rise; Chronic: significant rise",
        "note": "Causes: COPD, obesity-hypoventilation, opioid overdose,\nGuillain-Barré, myasthenia gravis, airway obstruction"
    },
    {
        "no": "14", "name": "Respiratory Alkalosis",
        "defect": "Primary ↓ pCO₂ (hyperventilation) → kidneys compensate by excreting HCO₃⁻. Causes: anxiety, fever, pain, PE, high altitude.",
        "findings": [
            ("pH",                         ">7.45",                       "↑"),
            ("pCO₂ (primary change)",      "<35 mmHg",                   "↓"),
            ("HCO₃⁻ (compensation)",       "Decreased (renal excretion)", "↓"),
            ("Acute compensation",         "ΔHCO₃⁻ = ΔpCO₂ × 0.2 ± 2.5", "◆"),
            ("Chronic compensation",       "ΔHCO₃⁻ = ΔpCO₂ × 0.5 ± 2.5", "◆"),
            ("Serum Ca²⁺ (ionised)",       "Low (↑pH binds Ca²⁺ to albumin → tetany)", "↓"),
            ("Serum K⁺",                   "Low (K⁺ enters cells)",       "↓"),
            ("Serum phosphate",            "Low (cellular uptake)",        "↓"),
        ],
        "hallmark": "✦ ↑pH + ↓pCO₂ (primary) + ↓HCO₃⁻ (compensation)\n✦ Tingling/tetany from ↓ionised Ca²⁺",
        "note": "Causes: Anxiety/panic, PE, pneumonia, hepatic failure,\nsalicylate poisoning (early), mechanical overventilation"
    },
]

# ── PAGE 3: Nutritional & LFT Cases 15–20 ───────────────────────────────
cases_p3 = [
    {
        "no": "15", "name": "Kwashiorkor",
        "defect": "Protein-deficient (but calorie-adequate) malnutrition. Low albumin → ↓oncotic pressure → oedema. Adequate carbs keep insulin elevated, limiting fat mobilisation → fatty liver.",
        "findings": [
            ("Serum albumin",              "<2.8 g/dL (normal 3.5–5.5 g/dL)", "↓"),
            ("Total protein",              "Low",                         "↓"),
            ("Blood glucose",              "Low-normal",                  "↓"),
            ("ALT/AST",                    "Elevated (fatty liver)",       "↑"),
            ("Haemoglobin",                "Low (anaemia)",                "↓"),
            ("Serum potassium",            "Low (hypokalaemia)",           "↓"),
            ("Serum magnesium",            "Low",                         "↓"),
            ("Serum zinc",                 "Low",                         "↓"),
            ("Serum transferrin",          "Low",                         "↓"),
        ],
        "hallmark": "✦ Very low albumin + oedema despite adequate calories\n✦ Pitting oedema + pot-belly + skin/hair changes\n✦ Fatty liver on imaging",
        "note": "Differentiates from Marasmus: marasmus has adequate protein\nbut caloric deficiency — no oedema, no fatty liver"
    },
    {
        "no": "16", "name": "Normal Liver Function Test (LFT)",
        "defect": "Reference normal values for all LFT parameters. Hepatocyte integrity, synthetic function, and biliary flow all normal.",
        "findings": [
            ("Total bilirubin",            "0.3–1.2 mg/dL",               "◆"),
            ("Direct (conjugated) bili",   "0–0.3 mg/dL",                 "◆"),
            ("Indirect (unconjugated) bili","0.2–0.8 mg/dL",              "◆"),
            ("ALT (SGPT)",                 "7–40 U/L",                    "◆"),
            ("AST (SGOT)",                 "10–40 U/L",                   "◆"),
            ("ALP",                        "44–147 U/L",                  "◆"),
            ("GGT",                        "5–40 U/L",                    "◆"),
            ("Albumin",                    "3.5–5.5 g/dL",                "◆"),
            ("Total protein",              "6.4–8.3 g/dL",                "◆"),
            ("PT/INR",                     "Normal (INR ~1.0)",            "◆"),
        ],
        "hallmark": "✦ All values within reference ranges\n✦ Baseline to compare against jaundice cases 18–20",
        "note": "ALT more liver-specific than AST\nALP elevated in both liver and bone disease"
    },
    {
        "no": "17", "name": "Oedema (Hypoalbuminaemia)",
        "defect": "Low serum albumin (any cause) → ↓plasma oncotic pressure → fluid shifts from intravascular to interstitial compartment → pitting oedema.",
        "findings": [
            ("Serum albumin",              "<3.0 g/dL (↓oncotic pressure)", "↓"),
            ("Total protein",              "Low",                         "↓"),
            ("Plasma oncotic pressure",    "Reduced (normal ~25 mmHg)",   "↓"),
            ("Urine protein (if renal)",   "May be >3.5 g/day (nephrotic)", "↑"),
            ("Serum sodium",               "Low to normal (dilutional)",   "↓"),
            ("Serum creatinine",           "Elevated if renal cause",      "↑"),
            ("ALT/AST",                    "Elevated if hepatic cause",    "↑"),
            ("NT-proBNP (if cardiac)",     "Elevated if cardiac cause",    "↑"),
        ],
        "hallmark": "✦ Low albumin <3.0 g/dL → ↓oncotic pressure → oedema\n✦ Pitting oedema; may have ascites, pleural effusion",
        "note": "Common causes: nephrotic syndrome, cirrhosis,\nkwashiorkor, protein-losing enteropathy, heart failure"
    },
    {
        "no": "18", "name": "Haemolytic Jaundice (Pre-hepatic)",
        "defect": "Excessive RBC destruction overwhelms liver conjugation capacity → unconjugated bilirubin accumulates. Liver and biliary tract intact.",
        "findings": [
            ("Total bilirubin",            "Elevated",                    "↑"),
            ("Indirect (unconjugated) bili","Markedly elevated (dominant)", "↑"),
            ("Direct (conjugated) bili",   "Normal / slightly elevated",  "◆"),
            ("Urine bilirubin",            "ABSENT (unconjugated = insoluble)", "◆"),
            ("Urine urobilinogen",          "Markedly increased",          "↑"),
            ("Stool colour",               "Dark (↑stercobilin)",         "↑"),
            ("ALT/AST/ALP",               "Normal",                      "◆"),
            ("Haptoglobin",               "Low (consumed by free Hb)",   "↓"),
            ("LDH",                        "Elevated",                    "↑"),
            ("Reticulocyte count",         "Elevated",                    "↑"),
        ],
        "hallmark": "✦ ↑Indirect bili + NO urine bilirubin (acholuric jaundice)\n✦ ↑Urobilinogen + dark stools + normal liver enzymes",
        "note": "Causes: sickle cell, G6PD deficiency, thalassaemia,\nautoimmune haemolytic anaemia, malaria, transfusion reaction"
    },
    {
        "no": "19", "name": "Obstructive Jaundice (Post-hepatic)",
        "defect": "Bile duct obstruction → conjugated bilirubin regurgitates into blood → dark urine + pale stools. ALP markedly elevated.",
        "findings": [
            ("Total bilirubin",            "Elevated",                    "↑"),
            ("Direct (conjugated) bili",   "Markedly elevated (dominant)", "↑"),
            ("Urine bilirubin",            "POSITIVE (conjugated = water-soluble) → dark urine", "↑"),
            ("Urine urobilinogen",          "ABSENT (no bile reaching gut)", "↓"),
            ("Stool colour",               "Pale/clay-coloured",          "↓"),
            ("ALP",                        "Markedly elevated (>3× normal)", "↑"),
            ("GGT",                        "Elevated",                    "↑"),
            ("ALT/AST",                    "Mildly elevated",             "↑"),
            ("PT",                         "Prolonged (↓Vit K absorption)", "↑"),
        ],
        "hallmark": "✦ ↑Direct bili + Dark urine + Pale stools + ↑ALP\n✦ Absent urobilinogen = no bile in gut",
        "note": "Causes: gallstones, carcinoma head of pancreas,\ncholangiocarcinoma, primary sclerosing cholangitis"
    },
    {
        "no": "20", "name": "Hepatic (Hepatocellular) Jaundice",
        "defect": "Hepatocyte damage → impaired conjugation + impaired secretion of bilirubin → both fractions elevated. Mixed pattern + markedly elevated transaminases.",
        "findings": [
            ("Total bilirubin",            "Elevated",                    "↑"),
            ("Direct bili",                "Elevated (conjugated leaks)", "↑"),
            ("Indirect bili",              "Elevated (impaired conjugation)", "↑"),
            ("ALT (SGPT)",                 "Markedly elevated (hallmark of hepatocyte damage)", "↑"),
            ("AST (SGOT)",                 "Markedly elevated",           "↑"),
            ("AST:ALT ratio",              ">2:1 in alcoholic hepatitis; <1 in viral", "↑"),
            ("ALP",                        "Mildly–moderately elevated",  "↑"),
            ("Urine bilirubin",            "Present",                     "↑"),
            ("Urine urobilinogen",         "Variable (↑early, ↓late)",    "◆"),
            ("Serum albumin / PT",         "Low albumin + prolonged PT (severe)", "↓"),
        ],
        "hallmark": "✦ Mixed bilirubin + Markedly ↑ALT/AST (hepatocyte necrosis)\n✦ AST:ALT >2:1 = alcoholic; <1 = viral hepatitis",
        "note": "Causes: viral hepatitis A/B/C, alcoholic hepatitis,\ndrug-induced liver injury (DILI), cirrhosis, Wilson disease"
    },
]

# ── PAGE 4: Renal + Organ-specific Cases 21–26 ──────────────────────────
cases_p4 = [
    {
        "no": "21", "name": "Normal Renal Function Test",
        "defect": "Reference normal values for all renal function parameters. Normal glomerular filtration, tubular function, and electrolyte balance.",
        "findings": [
            ("Serum creatinine",           "0.6–1.2 mg/dL (M); 0.5–1.1 (F)", "◆"),
            ("BUN (blood urea nitrogen)",  "7–20 mg/dL",                  "◆"),
            ("BUN:Creatinine ratio",       "10:1 to 20:1",                "◆"),
            ("eGFR",                       ">90 mL/min/1.73 m²",          "◆"),
            ("Urine protein (dipstick)",   "Negative (<150 mg/day)",       "◆"),
            ("Urine RBCs",                 "0–2/hpf",                     "◆"),
            ("Serum K⁺",                   "3.5–5.0 mEq/L",               "◆"),
            ("Serum Na⁺",                  "136–145 mEq/L",               "◆"),
            ("Urine specific gravity",     "1.010–1.030",                 "◆"),
        ],
        "hallmark": "✦ All parameters within reference ranges\n✦ eGFR >90 = CKD Stage G1 (normal/high)",
        "note": "CKD staging by eGFR: G1 >90, G2 60–89, G3a 45–59,\nG3b 30–44, G4 15–29, G5 <15 (kidney failure)"
    },
    {
        "no": "22", "name": "Acute Glomerulonephritis",
        "defect": "Immune complex deposition in glomeruli → complement activation → inflammation → haematuria + proteinuria + ↓GFR + HTN. Most common: post-streptococcal (PSGN).",
        "findings": [
            ("Urine colour",               "Smoky brown / cola-coloured",  "↑"),
            ("Urine RBCs",                 "Numerous + RBC CASTS (pathognomonic)", "↑"),
            ("Urine WBCs",                 "Present",                      "↑"),
            ("Urine protein",              "Moderate (1–3 g/day)",         "↑"),
            ("Serum creatinine",           "Elevated",                     "↑"),
            ("Serum C3 (complement)",      "LOW — consumed by immune complexes", "↓"),
            ("ASLO titre",                 "Elevated (post-streptococcal GN)", "↑"),
            ("Blood pressure",             "Hypertension",                 "↑"),
            ("Serum albumin",              "Normal or slightly low",       "◆"),
        ],
        "hallmark": "✦ RBC CASTS in urine = pathognomonic\n✦ ↓C3 + ↑ASLO confirms post-streptococcal GN",
        "note": "Causes: Group A β-haemolytic Streptococcus (most common),\nIgA nephropathy, SLE, Henoch-Schönlein purpura"
    },
    {
        "no": "23", "name": "Nephrotic Syndrome",
        "defect": "Glomerular filtration barrier disruption (podocyte injury) → massive protein leak → hypoalbuminaemia → ↓oncotic pressure → oedema + compensatory hyperlipidaemia.",
        "findings": [
            ("Urine protein",              ">3.5 g/day (massive — DEFINING)", "↑"),
            ("Serum albumin",              "<3.0 g/dL (hypoalbuminaemia)", "↓"),
            ("Serum cholesterol",          ">200 mg/dL (hyperlipidaemia)", "↑"),
            ("Serum triglycerides",        "Elevated",                     "↑"),
            ("Urine lipids",               "Oval fat bodies + Maltese cross (polarised)", "↑"),
            ("Serum creatinine",           "Normal early; elevated later", "◆"),
            ("Urine RBCs / RBC casts",     "Minimal (no haematuria typically)", "◆"),
            ("Serum complement (C3)",      "Normal (minimal change disease)", "◆"),
            ("Serum IgG",                  "Low (lost in urine)",          "↓"),
        ],
        "hallmark": "✦ TETRAD: Massive proteinuria + ↓Albumin + Oedema + Hyperlipidaemia\n✦ Maltese cross fat bodies on microscopy",
        "note": "Common causes: Minimal Change Disease (children),\nFocal Segmental GS, membranous nephropathy, DM, amyloid"
    },
    {
        "no": "24", "name": "Myocardial Infarction (MI)",
        "defect": "Coronary artery occlusion → myocardial ischaemia/necrosis → release of intracellular enzymes into blood. Troponin is gold standard marker.",
        "findings": [
            ("Troponin I / Troponin T",    "Elevated 3–6h; peak 12–24h; lasts 7–14 days", "↑"),
            ("CK-MB",                      "Elevated 4–6h; peak 18–24h; normal 48–72h", "↑"),
            ("Myoglobin",                  "Earliest rise (1–3h) but non-specific", "↑"),
            ("LDH (LD₁ > LD₂)",           "Elevated 24–48h; peak 3–6 days", "↑"),
            ("AST",                        "Moderately elevated",          "↑"),
            ("WBC",                        "Elevated (inflammatory response)", "↑"),
            ("ESR / CRP",                  "Elevated",                    "↑"),
            ("ECG",                        "ST elevation (STEMI) or depression (NSTEMI)", "↑"),
            ("Serum K⁺",                   "May be elevated or low (arrhythmia risk)", "◆"),
        ],
        "hallmark": "✦ Troponin = gold standard (most sensitive + specific)\n✦ CK-MB used for re-infarction (normalises faster)",
        "note": "Timeline: Myoglobin (1-3h) → Troponin (3-6h) → CK-MB (4-6h)\n→ LDH (24-48h). Troponin stays elevated longest."
    },
    {
        "no": "25", "name": "Hypothyroidism",
        "defect": "Thyroid hormone deficiency (primary: thyroid failure; secondary: pituitary TSH deficiency). Slows metabolism, reduces thermogenesis.",
        "findings": [
            ("TSH",                        "Markedly elevated (primary hypothyroidism)", "↑"),
            ("Free T4 (FT4)",              "Low (<0.8 ng/dL)",             "↓"),
            ("Free T3 (FT3)",              "Low",                          "↓"),
            ("Serum cholesterol (LDL)",    "Elevated (↓LDL receptor expression)", "↑"),
            ("Serum triglycerides",        "Elevated",                     "↑"),
            ("Serum CK",                   "Elevated (hypothyroid myopathy)", "↑"),
            ("Serum Na⁺",                  "Low (SIADH-like hyponatraemia)", "↓"),
            ("Haemoglobin",               "Low (normocytic anaemia)",     "↓"),
            ("TSH (2° hypothyroidism)",    "Low or inappropriately normal", "↓"),
        ],
        "hallmark": "✦ ↑TSH + ↓FT4 = primary hypothyroidism (most sensitive)\n✦ TSH is the single best screening test",
        "note": "Normal TSH: 0.3–4.5 mIU/L\nTx: Levothyroxine (T4) replacement; re-check TSH in 6–8 weeks"
    },
    {
        "no": "26", "name": "Acute Pancreatitis",
        "defect": "Premature activation of pancreatic enzymes within acinar cells → auto-digestion → inflammation. Commonest causes: gallstones, alcohol.",
        "findings": [
            ("Serum lipase",               ">3× ULN (most specific; lasts up to 14 days)", "↑"),
            ("Serum amylase",              ">3× ULN (rises 2–12h; normalises 3–5 days)", "↑"),
            ("WBC",                        "12,000–20,000/μL",            "↑"),
            ("Blood glucose",              "Elevated (glucagon ↑, insulin ↓)", "↑"),
            ("Serum calcium",              "LOW — saponification (poor prognostic sign)", "↓"),
            ("Serum LDH",                  "Elevated",                    "↑"),
            ("ALT",                        "Elevated if gallstone-related (>3× = biliary cause)", "↑"),
            ("Serum triglycerides",        "Elevated (may be causative if >1000 mg/dL)", "↑"),
            ("Haematocrit",               "Elevated (haemoconcentration)", "↑"),
            ("BUN",                        "Elevated (pre-renal AKI)",    "↑"),
        ],
        "hallmark": "✦ Lipase >3× ULN = most specific biochemical test\n✦ ↓Ca²⁺ = poor prognostic sign (Ranson's criteria)",
        "note": "Ranson's: glucose >200, LDH >350, AST >250, WBC >16,000, age >55\nDiagnosis: 2 of 3 criteria (pain + lipase + imaging)"
    },
]

# ═══════════════════════════════════════════════════════════════════════════
# JAUNDICE COMPARISON TABLE (bonus — Page 5)
# ═══════════════════════════════════════════════════════════════════════════
def build_jaundice_table():
    headers = ["Parameter", "Normal LFT\n(Case 16)", "Haemolytic Jaundice\n(Case 18)", "Obstructive Jaundice\n(Case 19)", "Hepatic Jaundice\n(Case 20)"]
    cw = [4.5*cm, 4.8*cm, 5.5*cm, 5.5*cm, 5.5*cm]

    def c(text, bold=False, col=None):
        st = ParagraphStyle("jc", parent=cell_style,
            fontName="Helvetica-Bold" if bold else "Helvetica",
            textColor=col or BODY_TEXT, fontSize=7.0, leading=9.5)
        return Paragraph(text, st)

    rows = [
        [H(h) for h in headers],
        [c("Total Bilirubin",bold=True), c(f"{NORM} Normal\n0.3–1.2 mg/dL"), c(f"{UP} Elevated"), c(f"{UP} Elevated"), c(f"{UP} Elevated")],
        [c("Indirect (Unconjugated)\nBilirubin",bold=True), c(f"{NORM} Normal\n0.2–0.8 mg/dL"), c(f"{UP} <b>Markedly ↑↑</b>\n(dominant fraction)", bold=True), c(f"{NORM} Normal / slight ↑"), c(f"{UP} Elevated")],
        [c("Direct (Conjugated)\nBilirubin",bold=True), c(f"{NORM} Normal\n0–0.3 mg/dL"), c(f"{NORM} Normal / slight ↑"), c(f"{UP} <b>Markedly ↑↑</b>\n(dominant fraction)", bold=True), c(f"{UP} Elevated")],
        [c("Urine Bilirubin",bold=True), c(f"{NORM} Absent"), c(f"{NORM} <b>ABSENT</b>\n(insoluble form)"), c(f"{UP} <b>PRESENT</b>\n(dark urine)", bold=True), c(f"{UP} Present")],
        [c("Urine Urobilinogen",bold=True), c(f"{NORM} Normal (trace)"), c(f"{UP} <b>Markedly ↑↑</b>"), c(f"{DOWN} <b>ABSENT</b>\n(no bile in gut)", bold=True), c(f"{NORM} Variable")],
        [c("Stool Colour",bold=True), c(f"{NORM} Normal brown"), c(f"{UP} Dark (↑stercobilin)"), c(f"{DOWN} <b>Pale/clay</b>\n(no stercobilin)"), c(f"{NORM} Normal to pale")],
        [c("ALT / AST",bold=True), c(f"{NORM} Normal"), c(f"{NORM} Normal"), c(f"{NORM} Mildly elevated"), c(f"{UP} <b>Markedly ↑↑</b>\n(hepatocyte damage)")],
        [c("ALP",bold=True), c(f"{NORM} Normal\n44–147 U/L"), c(f"{NORM} Normal"), c(f"{UP} <b>Markedly ↑↑</b>\n(>3× normal)"), c(f"{UP} Mildly–moderately ↑")],
        [c("Serum Albumin / PT",bold=True), c(f"{NORM} Normal"), c(f"{NORM} Normal"), c(f"{DOWN} PT prolonged\n(↓Vit K absorption)"), c(f"{DOWN} ↓ Albumin\nPT prolonged (severe)")],
        [c("Haptoglobin / LDH",bold=True), c(f"{NORM} Normal"), c(f"{DOWN} ↓ Haptoglobin\n{UP} ↑ LDH"), c(f"{NORM} Normal"), c(f"{NORM} Normal")],
        [c("Reticulocyte Count",bold=True), c(f"{NORM} Normal (0.5–1.5%)"), c(f"{UP} Elevated (5–15%)\n(compensatory haematopoiesis)"), c(f"{NORM} Normal"), c(f"{NORM} Normal")],
        [c("Key Finding",bold=True),
         c(f"All parameters\nwithin normal range", bold=True),
         c(f"★ <b>Acholuric jaundice</b>\n↑Indirect + no urine bili\n+ ↑urobilinogen", bold=True),
         c(f"★ <b>Dark urine +\nPale stools + ↑ALP</b>", bold=True),
         c(f"★ <b>Markedly ↑ALT/AST</b>\nMixed bilirubin pattern", bold=True)],
    ]

    t = Table(rows, colWidths=cw, repeatRows=1)
    st = TableStyle([
        ("BACKGROUND",    (0,0), (-1,0), DARK_BLUE),
        ("TEXTCOLOR",     (0,0), (-1,0), HEADER_TEXT),
        ("ALIGN",         (0,0), (-1,0), "CENTER"),
        ("VALIGN",        (0,0), (-1,-1), "TOP"),
        ("GRID",          (0,0), (-1,-1), 0.35, GREY_LIGHT),
        ("LINEBELOW",     (0,0), (-1,0), 1.2, ACCENT),
        ("TOPPADDING",    (0,0), (-1,-1), 3),
        ("BOTTOMPADDING", (0,0), (-1,-1), 3),
        ("LEFTPADDING",   (0,0), (-1,-1), 4),
        ("RIGHTPADDING",  (0,0), (-1,-1), 4),
        ("BACKGROUND",    (0,1), (0,-1), LIGHT_BLUE),
        ("FONTNAME",      (0,1), (0,-1), "Helvetica-Bold"),
        # Alternate data rows
        ("BACKGROUND",    (1,2), (-1,2), ROW_ALT),
        ("BACKGROUND",    (1,4), (-1,4), ROW_ALT),
        ("BACKGROUND",    (1,6), (-1,6), ROW_ALT),
        ("BACKGROUND",    (1,8), (-1,8), ROW_ALT),
        ("BACKGROUND",    (1,10),(-1,10), ROW_ALT),
        ("BACKGROUND",    (1,12),(-1,12), ROW_ALT),
        # Highlight hallmarks in last row
        ("BACKGROUND",    (1,12), (-1,12), colors.HexColor("#fef3c7")),
        # Highlight dominant findings per column
        ("BACKGROUND",    (2,2), (2,2), colors.HexColor("#fee2e2")),  # haemolytic indirect ↑
        ("BACKGROUND",    (3,3), (3,3), colors.HexColor("#fee2e2")),  # obstructive direct ↑
        ("BACKGROUND",    (3,5), (3,5), colors.HexColor("#fef3c7")),  # obstructive urine bili
        ("BACKGROUND",    (3,6), (3,6), colors.HexColor("#d1fae5")),  # obstructive urobilinogen absent
        ("BACKGROUND",    (4,8), (4,8), colors.HexColor("#fee2e2")),  # hepatic ALT ↑↑
    ])
    t.setStyle(st)
    return t

# ═══════════════════════════════════════════════════════════════════════════
# ASSEMBLE
# ═══════════════════════════════════════════════════════════════════════════
elements = []

# Page 1
elements += make_title_block(
    "Major Cases Reference Card — Biochemistry Lab Practical",
    "Cases 1–7: Glucose Tolerance Test (GTT) Patterns  |  ▲ Increased  ▼ Decreased  ◆ Normal/Special"
)
elements.append(build_case_table(cases_p1))
elements.append(PageBreak())

# Page 2
elements += make_title_block(
    "Major Cases Reference Card — Biochemistry Lab Practical",
    "Cases 8–14: Ketosis & Acid-Base Disorders  |  ▲ Increased  ▼ Decreased  ◆ Normal/Special"
)
elements.append(build_case_table(cases_p2))
elements.append(PageBreak())

# Page 3
elements += make_title_block(
    "Major Cases Reference Card — Biochemistry Lab Practical",
    "Cases 15–20: Nutritional Disorders, Oedema & Jaundice  |  ▲ Increased  ▼ Decreased  ◆ Normal/Special"
)
elements.append(build_case_table(cases_p3))
elements.append(PageBreak())

# Page 4
elements += make_title_block(
    "Major Cases Reference Card — Biochemistry Lab Practical",
    "Cases 21–26: Renal Function, MI, Hypothyroidism & Acute Pancreatitis  |  ▲ Increased  ▼ Decreased  ◆ Normal/Special"
)
elements.append(build_case_table(cases_p4))
elements.append(PageBreak())

# Page 5: Jaundice Comparison
elements += make_title_block(
    "Major Cases Reference Card — Biochemistry Lab Practical",
    "Jaundice Comparison Table: Cases 16, 18, 19, 20 — Side-by-Side LFT Pattern Analysis"
)
intro = (
    "<b>Jaundice</b> = serum bilirubin >2.5 mg/dL (visible scleral icterus). "
    "The three types differ in the fraction of bilirubin elevated, urine/stool findings, and enzyme patterns. "
    "<b>★</b> = hallmark finding.  "
    f"<b>{UP} Red ▲</b> = elevated  |  "
    f"<b>{DOWN} Blue ▼</b> = decreased  |  "
    f"<b>{NORM} Green ◆</b> = normal"
)
elements.append(Paragraph(intro, ParagraphStyle("intro2", parent=cell_style, fontSize=7.5, spaceAfter=5)))
elements.append(build_jaundice_table())
elements.append(Spacer(1, 0.3*cm))

# Legend
legend_data = [[
    Paragraph(f'{UP} <b>▲ Increased</b>', cell_style),
    Paragraph(f'{DOWN} <b>▼ Decreased</b>', cell_style),
    Paragraph(f'{NORM} <b>◆ Normal / Special</b>', cell_style),
    Paragraph('<b>★ = Hallmark / Pathognomonic</b>', cell_style),
    Paragraph('All values approximate — confirm with local laboratory reference ranges', note_style),
]]
lt = Table(legend_data, colWidths=[3.2*cm, 3.2*cm, 4.2*cm, 6.5*cm, 8.5*cm])
lt.setStyle(TableStyle([
    ("BACKGROUND",    (0,0), (-1,-1), colors.HexColor("#f8fafc")),
    ("BOX",           (0,0), (-1,-1), 0.5, GREY_LIGHT),
    ("VALIGN",        (0,0), (-1,-1), "MIDDLE"),
    ("TOPPADDING",    (0,0), (-1,-1), 3),
    ("BOTTOMPADDING", (0,0), (-1,-1), 3),
    ("LEFTPADDING",   (0,0), (-1,-1), 6),
]))
elements.append(lt)

doc.build(elements, onFirstPage=on_page, onLaterPages=on_page)
print(f"PDF created: {OUTPUT}")

Running Command

cd /home/daytona/workspace/major-cases-pdf && python build_pdf.py 2>&1

Running Command

ls -lh /home/daytona/workspace/major-cases-pdf/Major_Cases_Reference_Card.pdf

Your PDF is ready:

Major Cases Reference Card

PDF Document · PDF

What's inside (5 landscape A4 pages):

Page	Cases	Content
1	1–7	GTT Patterns (Normal GTT, Type II DM, Renal Glycosuria, Abnormal GTT, 3 GTT graphs)
2	8–14	Ketosis & Acid-Base Disorders (Starvation Ketosis, DKA, Normal ABG, Met. Acidosis, Met. Alkalosis, Resp. Acidosis, Resp. Alkalosis)
3	15–20	Nutritional, Oedema & Jaundice (Kwashiorkor, Normal LFT, Oedema, Haemolytic, Obstructive, Hepatic Jaundice)
4	21–26	Renal Function, MI, Hypothyroidism, Acute Pancreatitis
5	18–20	Bonus: Jaundice Comparison Table — all 4 jaundice patterns side-by-side with every parameter

Design features match the Minor Cases card:

▲ Red elevated / ▼ Blue decreased / ◆ Green normal at a glance
Pathophysiology column explains the "why" behind each lab pattern
Hallmark findings in bold italic blue
Compensation formulas included for all acid-base cases
Enzyme timeline for MI (Myoglobin → Troponin → CK-MB → LDH)
Ranson's criteria listed for acute pancreatitis
Page border + footer disclaimer on every page

Asking for Preferences

Finding Sources

Here is the complete, detailed explanation of all three qualitative urine analysis experiments:

Qualitative Experiments — Urine Analysis

Experiment 3 (BC14.3): Normal Constituents of Urine

Aim

To perform urine analysis and identify the normal physical and chemical constituents of urine.

A. Physical Examination of Urine

Property	Normal Finding	Clinical Significance
Volume	1000–1500 mL/24 hours	<400 mL = oliguria; <100 mL = anuria; >2500 mL = polyuria
Colour	Pale yellow to amber (due to urochrome pigment)	Dark yellow = concentrated; colourless = dilute; red-brown = haematuria/haemoglobinuria
Transparency	Clear (transparent)	Turbid = infection, phosphaturia, pyuria, chyluria
Odour	Faintly aromatic (due to volatile organic acids)	Fruity/sweet = ketones (DKA); ammoniacal = UTI/old sample; fishy = trimethylaminuria
Specific gravity	1.010–1.030	Fixed at 1.010 = isosthenuria (renal tubular failure); >1.030 = concentrated; <1.003 = overhydration/diabetes insipidus
pH	4.6–8.0 (average 6.0 = slightly acidic)	Acidic in protein-rich diets, fever, DKA; alkaline in UTI, vegetarian diet, RTA
Deposit/Sediment	None on standing	Phosphate precipitate = white; urate = pink "brick dust"

B. Chemical Examination — Normal Constituents

Normal urine is an aqueous solution of these organic and inorganic substances:

Organic Constituents

Constituent	Normal Excretion / Day	Notes
Urea	20–35 g/day	Largest organic constituent; ~90% of total urinary nitrogen; end-product of protein catabolism
Creatinine	1–2 g/day (men); 0.8–1.8 g/day (women)	Derived from creatine phosphate in muscle; constant daily excretion (reflects muscle mass)
Uric acid	250–750 mg/day	End-product of purine metabolism (xanthine oxidase pathway); insoluble in acid urine
Ammonia	30–50 mEq/day (0.5–1.0 g/day)	Produced in renal tubules from glutamine; buffers urine acidity
Amino acids	1–3 g/day (small amounts)	Overflow from plasma; increased in liver failure, Fanconi syndrome
Hippuric acid	<1 g/day	Conjugation product of benzoic acid + glycine
Creatine	Trace (<150 mg/day in men)	Elevated in children, pregnancy, muscle disease
Urobilinogen	0.5–4.0 mg/day (trace)	Formed in gut from bilirubin; small amount reabsorbed and excreted in urine
Pigments (urochrome)	Variable	Responsible for yellow colour

Inorganic Constituents

Constituent	Normal Excretion / Day	Notes
Chloride (Cl⁻)	110–250 mEq/day	Largest inorganic constituent; reflects dietary salt intake
Sodium (Na⁺)	130–260 mEq/day	Varies with diet; low in hypovolaemia, adrenal insufficiency
Potassium (K⁺)	25–125 mEq/day	Low in hypokalaemia; high in hyperaldosteronism
Phosphate (PO₄³⁻)	0.4–1.3 g/day	Important urinary buffer (titratable acid)
Sulphate (SO₄²⁻)	1.5–3.0 g/day	From amino acid catabolism (methionine, cysteine)
Calcium (Ca²⁺)	100–300 mg/day	Low in rickets, hypoparathyroidism; high in hypercalcaemia
Magnesium (Mg²⁺)	6–8 mEq/day	Variable

Key teaching point: Normal urine does NOT contain glucose, protein (>trace), ketones, bilirubin, blood, RBCs, or casts.

(Harper's Illustrated Biochemistry 32e; Basic Medical Biochemistry 6e)

C. Dipstick / Reagent Strip Analysis (Normal Results)

Parameter	Normal Result
Glucose	Negative
Protein	Negative (trace may be normal: <10 mg/dL)
Ketones	Negative
Blood / Hb	Negative
Bilirubin	Negative
Urobilinogen	Trace (0.1–1.0 mg/dL = normal)
Nitrites	Negative
Leukocyte esterase	Negative
pH	5.0–7.0
Specific gravity	1.010–1.030

Experiment 4 (BC14.4): Abnormal Urine Constituents — Glucose & Ketone Bodies

Aim

To identify glucose and ketone bodies as abnormal urine constituents and correlate with pathological states.

A. Urine Glucose (Glucosuria)

Normal: Absent. Urine glucose <500 mg/day (practically nil on dipstick). Abnormal (glucosuria): Present when blood glucose exceeds the renal threshold (~180 mg/dL).

Tests for Urine Glucose

1. Benedict's Test (Qualitative / Semi-quantitative)

Step	Detail
Reagent	Benedict's reagent = Sodium carbonate + Sodium citrate + Copper sulphate (CuSO₄) in alkaline solution
Principle	Reducing sugars (glucose, galactose, fructose, lactose) reduce Cu²⁺ (blue) to Cu⁺ (cuprous oxide = brick-red precipitate) in hot alkaline conditions
Procedure	Add 5 drops urine to 5 mL Benedict's reagent; heat in boiling water bath 5 minutes
Result - Positive	Green → Yellow → Orange → Brick-red precipitate
Result - Negative	Solution remains blue (no reducing substance)
Important	Benedict's is a test for REDUCING SUGARS — NOT specific for glucose

Colour	Approximate Glucose Concentration
Blue (negative)	<0.5 g%
Green turbid (+)	~0.5 g%
Yellow (+++)	~1.0 g%
Orange (++)	~1.5 g%
Brick red (++++)	>2.0 g%

2. Glucose Oxidase Strip (Dipstick) — Specific for Glucose

Principle	Glucose oxidase converts glucose → gluconic acid + H₂O₂ → H₂O₂ + chromogen → colour change
Advantage	Specific for D-glucose only (unlike Benedict's)
Limitation	False negatives with ascorbic acid; false positives with oxidising agents

Pathological States Causing Glucosuria

Condition	Blood Glucose	Mechanism
Type 1 / Type 2 Diabetes Mellitus	High (>180 mg/dL)	Hyperglycaemia exceeds renal threshold → glucose spills into urine
Renal Glycosuria	Normal	Renal tubular defect (low Tmax or threshold); glucose in urine despite normal blood glucose
Gestational Diabetes	High	Reduced renal threshold in pregnancy + hyperglycaemia
Cushing syndrome	High	Cortisol-induced hyperglycaemia
Stress hyperglycaemia	High (transient)	Adrenaline → gluconeogenesis
Galactosuria	Normal blood glucose	Galactosemia; Benedict's positive but glucose oxidase NEGATIVE (galactose is not glucose)
Fructosuria (HFI)	Normal	Aldolase B deficiency; reducing sugar in urine

Key differentiation: Benedict's positive + Glucose oxidase NEGATIVE = non-glucose reducing sugar (galactose, fructose, lactose) — NOT diabetes.

B. Urine Ketone Bodies (Ketonuria)

Normal: Absent. Ketone bodies: Acetoacetate (AcAc), Beta-hydroxybutyrate (β-OHB), Acetone. Produced in liver when fatty acid oxidation is excessive.

Tests for Urine Ketones

1. Rothera's Test

Step	Detail
Reagent	Rothera's reagent = Ammonium sulphate + Sodium nitroprusside (sodium nitroferricyanide); concentrated ammonia
Principle	Acetoacetate and acetone react with sodium nitroprusside in alkaline conditions → purple/violet colour
Procedure	Add Rothera's powder to urine; add conc. ammonia along sides of tube
Positive result	Purple/violet ring at the interface (within 2 minutes)
Negative result	No colour change / brown ring only
Note	Does NOT detect β-hydroxybutyrate (the predominant ketone in DKA)

2. Gerhardt's Test (Ferric Chloride Test)

Reagent	10% Ferric chloride (FeCl₃) solution
Principle	FeCl₃ reacts with acetoacetate → Bordeaux red / port wine colour
Procedure	Add a few drops 10% FeCl₃ to urine
Positive	Bordeaux red / wine-red colour
Interference	Salicylates also give a purple colour → distinguish by heating (salicylate colour persists; acetoacetate colour disappears on heating)

3. Dipstick (Nitroprusside reaction)

Same as Rothera's principle; detects acetoacetate and acetone but NOT β-hydroxybutyrate.

Pathological States Causing Ketonuria

Condition	Mechanism
Diabetic Ketoacidosis (DKA)	Absolute insulin deficiency → massive lipolysis → massive ketogenesis; glucose >250 + ketonuria + acidosis
Starvation / Prolonged fasting	Relative insulin deficiency → mild ketosis; glucose low/normal; mild ketonuria
Alcoholic ketoacidosis	Alcohol + poor nutrition → ketosis; glucose may be normal or low
Prolonged vomiting	Starvation effect → ketosis
High-fat low-carb diet	Physiological ketosis (no acidosis)
Febrile illness in children	Increased metabolic demand + poor intake → starvation ketosis
Pregnancy (morning sickness)	Starvation effect → mild ketonuria

DKA vs. Starvation Ketosis:

Feature	DKA	Starvation Ketosis
Blood glucose	>250 mg/dL	Low/normal
Urine glucose	Strongly positive	Negative
Urine ketones	Strongly positive	Mildly positive
pH	<7.30	Normal to slightly ↓
Severity	Life-threatening	Mild, self-limiting

(Rosen's Emergency Medicine; Roberts & Hedges' Clinical Procedures)

Experiment 5 (BC14.4): Abnormal Urine Constituents — Protein & Blood

Aim

To identify protein and blood as abnormal urine constituents and correlate with pathological states.

A. Urine Protein (Proteinuria)

Normal: <150 mg/day total protein; <30 mg/day albumin. Abnormal: >150 mg/day = proteinuria (dipstick detects predominantly albumin).

Tests for Urine Protein

1. Heat and Acetic Acid Test (Heat Coagulation Test)

Step	Detail
Procedure	Fill test tube 2/3 with urine; heat upper portion in flame until boiling; observe for turbidity/precipitate; add 2–3 drops 5% acetic acid; re-observe
Positive	White turbidity/precipitate forms on heating; persists or increases on adding acetic acid
Negative	No turbidity, or turbidity disappears on adding acetic acid
Principle	Heat denatures proteins → precipitate. Acetic acid: dissolves phosphate precipitate (false positive) and urates, while protein precipitate persists or increases
Why add acid?	To distinguish protein precipitate from phosphate precipitate (phosphates dissolve in acid; protein does not)

2. Heller's Test (Nitric Acid Ring Test)

Step	Detail
Procedure	Carefully layer concentrated nitric acid under urine in a test tube (tilt tube)
Positive	White ring at interface of acid and urine
Negative	No white ring
Principle	Concentrated HNO₃ denatures proteins → white precipitate at interface
Note	Yellow ring = urates (not protein); red ring = bile pigments (bilirubin) — interpret carefully

3. Sulphosalicylic Acid (SSA) Test

Procedure	Add 3-5 drops 3% SSA to urine
Positive	White turbidity/precipitate
Advantage	More sensitive than heat test; detects all proteins including Bence-Jones (myeloma)
Note	False positive with X-ray contrast media, penicillin

4. Dipstick (Tetrabromophenol blue — pH indicator)

Grade	Approximate Protein
Negative	<10 mg/dL
Trace	10–20 mg/dL
1+	~30 mg/dL
2+	~100 mg/dL
3+	~300 mg/dL
4+	>2000 mg/dL

Limitation: Detects albumin primarily. Misses Bence-Jones protein (myeloma) and globulins → SSA test more sensitive.

Pathological States Causing Proteinuria

Condition	Degree	Type	Notes
Nephrotic syndrome	Massive (>3.5 g/day)	Glomerular (selective)	Minimal change disease, membranous nephropathy, FSGS
Acute glomerulonephritis	Moderate (1–3 g/day)	Glomerular (non-selective)	+ haematuria + RBC casts
Chronic kidney disease	Variable	Glomerular/tubular	Progressive
Pre-eclampsia	>300 mg/day	Glomerular	+ hypertension after 20 weeks
Multiple myeloma	Variable (Bence-Jones)	Overflow	Light chains; missed on dipstick; SSA positive
Fever / exercise	Transient, mild	Functional	Self-resolving
Orthostatic proteinuria	Mild	Postural	Young adults; present when upright, absent when supine
UTI/pyelonephritis	Mild	Tubular	+ WBCs + bacteria
Diabetic nephropathy	Microalbuminuria → macro	Glomerular	30–300 mg/day = microalbuminuria (early marker)

B. Urine Blood (Haematuria / Haemoglobinuria)

Normal: 0–2 RBCs/hpf on microscopy; negative on dipstick.

Tests for Urine Blood

1. Dipstick (Benzidine/TMB peroxidase reaction)

Principle	Haemoglobin + peroxidase activity → oxidises chromogen → colour change (green to blue)
Positive	Green or blue-green colour on dipstick
Detects	Both intact RBCs AND free haemoglobin/myoglobin
Sensitivity	91–100% for haematuria
Note	Positive for both haematuria AND haemoglobinuria AND myoglobinuria — microscopy needed to distinguish

2. Microscopic Examination

Finding	Significance
RBCs >3/hpf	Haematuria (actual red blood cells present)
Dysmorphic RBCs (acanthocytes)	Glomerular origin
RBC casts	Glomerulonephritis (pathognomonic)
No RBCs but dipstick positive	Haemoglobinuria or myoglobinuria

3. Occult Blood Test (Guaiac-based)

Detects haemoglobin peroxidase activity; used when visible haematuria absent.

Differentiation: Haematuria vs. Haemoglobinuria vs. Myoglobinuria

Feature	Haematuria	Haemoglobinuria	Myoglobinuria
Urine colour	Red/pink	Red-brown (clear)	Dark red-brown/cola
Dipstick blood	Positive	Positive	Positive
Urine microscopy RBCs	Present (>3/hpf)	Absent	Absent
Serum haptoglobin	Normal	Low (consumed)	Normal
Serum CK	Normal	Normal	Markedly elevated
Plasma haemoglobin	Normal	Elevated (pink plasma)	Normal
Cause	Stones, UTI, GN, tumour	Haemolysis, paroxysmal Hb-uria, march Hb-uria	Rhabdomyolysis, crush injury, statin myopathy

Pathological States — Haematuria

Cause	Type	Key Features
Acute glomerulonephritis	Glomerular (microscopic)	RBC casts + proteinuria + ↓C3
IgA nephropathy	Glomerular	Episodic gross haematuria after URTI
Nephrolithiasis (stones)	Post-glomerular	Colicky flank pain; calcium oxalate crystals
UTI/Cystitis	Lower tract	Dysuria + frequency + WBCs + bacteria
Bladder carcinoma	Lower tract	Painless haematuria in elderly smoker
Renal cell carcinoma	Upper tract	Flank pain + mass + haematuria triad
Trauma	Any level	History of injury
Haemophilia / anticoagulants	Systemic	Coagulopathy
SLE nephritis	Glomerular	ANA positive + systemic features

(Henry's Clinical Diagnosis; Brenner & Rector's The Kidney; Guyton & Hall)

Experiment 6 (BC14.4): Abnormal Urine Constituents — Bile Salts & Bile Pigments

Aim

To identify bile salts and bile pigments as abnormal urine constituents and correlate with pathological states.

A. Bile Salts in Urine

Normal: Absent. Bile salts are large molecules not filtered by normal glomeruli. Abnormal: Present in obstructive and hepatocellular jaundice.

Test for Bile Salts

Hay's Sulphur (Hay's Test)

Step	Detail
Principle	Bile salts (sodium taurocholate, sodium glycocholate) lower the surface tension of urine. Fine sulphur powder floats on normal urine (high surface tension) but sinks in urine containing bile salts (low surface tension).
Procedure	Sprinkle very fine precipitated sulphur powder on the surface of urine at room temperature
Positive	Sulphur powder SINKS (reduced surface tension due to bile salts)
Negative	Sulphur powder floats
Important	Test must be done at room temperature (warm urine reduces surface tension non-specifically)

Clinical Significance of Bile Salts in Urine

Condition	Bile Salts in Urine	Mechanism
Obstructive jaundice	Positive (strongly)	Conjugated bilirubin + bile salts regurgitated into blood → filtered in urine
Hepatocellular jaundice	Positive	Damaged hepatocytes release bile constituents into blood
Haemolytic jaundice	Negative	Liver and biliary tract intact; only unconjugated bilirubin elevated (insoluble)
Normal	Negative	Bile salts do not enter blood under normal conditions

B. Bile Pigments in Urine (Bilirubin & Urobilinogen)

1. Urine Bilirubin (Conjugated Bilirubin)

Normal: Absent (conjugated bilirubin in blood is normally very low and immediately excreted in bile). Abnormal: Present when conjugated bilirubin is elevated in blood (water-soluble → filterable by glomerulus).

Test: Fouchet's Test

Principle	BaCl₂ precipitates bilirubin from urine; Fouchet's reagent (FeCl₃ + trichloroacetic acid) oxidises bilirubin → green (biliverdin)
Procedure	Add BaCl₂ to urine → filter → place Fouchet's reagent on filter paper
Positive	Green colour on filter paper
Negative	No colour change

Test: Gmelin's Test

Principle	Concentrated HNO₃ oxidises bilirubin through a series of colour changes (green → blue → violet → red → yellow)
Procedure	Layer concentrated HNO₃ under urine in a test tube
Positive	Play of colours (green band = biliverdin, blue/violet, red, yellow from outer to inner)
Negative	Only yellow ring (nitric acid-urate interface)
Note	This is more sensitive; the characteristic spectrum of colours = positive

Dipstick Test: Diazonium salt reacts with conjugated bilirubin → purple/blue colour. Specific for conjugated bilirubin.

2. Urine Urobilinogen

Normal: Trace amount (0.5–4.0 mg/day; 0.1–1.0 mg/dL). Pathway: Conjugated bilirubin → (gut bacteria) → urobilinogen → some reabsorbed from gut → portal vein → liver (mostly re-excreted) → small amount escapes to blood → filtered by kidney → urine urobilinogen.

Test: Ehrlich's Test (Aldehyde Test)

Reagent	Ehrlich's reagent = Para-dimethylaminobenzaldehyde (DMAB) in concentrated HCl
Principle	Urobilinogen + Ehrlich's reagent (aldehyde) → pink/cherry-red colour in acid medium
Procedure	Add 2 mL Ehrlich's reagent to 10 mL urine; mix
Positive	Cherry-red / pink colour immediately or within 5 minutes
Negative	Yellow/no colour
Dilution test	Positive in dilutions 1:20 or beyond = significant
Note	Porphobilinogen (PBG) also gives a positive Ehrlich's test — distinguished by solvent extraction (urobilinogen extracted into chloroform; PBG is NOT)

Interpretation — Bile Pigments in Different Types of Jaundice

Parameter	Normal	Haemolytic Jaundice (Pre-hepatic)	Obstructive Jaundice (Post-hepatic)	Hepatocellular Jaundice
Urine bilirubin	Absent	Absent (unconjugated = insoluble)	Strongly positive (dark urine)	Positive
Urine urobilinogen	Trace	Markedly increased	Absent (no bile reaches gut)	Variable (↑ early, ↓ late)
Bile salts (Hay's)	Negative	Negative	Strongly positive	Positive
Stool colour	Normal brown	Dark (↑stercobilin)	Pale/clay (no stercobilin)	Normal to pale
Serum indirect bili	Normal	Markedly elevated	Normal/slight ↑	Elevated
Serum direct bili	Normal	Normal	Markedly elevated	Elevated

(Guyton & Hall Medical Physiology; Tietz Textbook of Laboratory Medicine; Campbell Walsh Urology)

Summary Table — All Abnormal Urine Constituents

Constituent	Test	Positive Result	Associated Pathology
Glucose	Benedict's	Brick-red precipitate	DM, renal glycosuria
Glucose (specific)	Glucose oxidase strip	Green/blue colour change	DM (not other reducing sugars)
Ketones	Rothera's	Purple ring at interface	DKA, starvation, alcoholic ketosis
Ketones	Gerhardt's (FeCl₃)	Bordeaux red	Acetoaceturia
Protein	Heat + acetic acid	White precipitate persists	Nephrotic syndrome, GN, myeloma
Protein	Heller's (nitric acid)	White ring at interface	Proteinuria any cause
Blood	Dipstick	Green/blue	Haematuria, haemoglobinuria
Bilirubin	Fouchet's	Green on filter paper	Obstructive/hepatic jaundice
Bilirubin	Gmelin's	Play of colours (green-blue-red)	Obstructive/hepatic jaundice
Urobilinogen	Ehrlich's	Cherry-red colour	Haemolytic/hepatic jaundice
Bile salts	Hay's sulphur	Sulphur sinks	Obstructive/hepatic jaundice

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