As an mbbs student I have to know all lab values so Give me all normal laboratory valuesb with abnormal values what does it mean.
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I now have all the key data I need from authoritative textbooks to compile a comprehensive reference. Let me put together the full answer.
Complete Normal Laboratory Values for MBBS Students
A thorough, system-by-system reference compiled from Goldman-Cecil Medicine, Henry's Clinical Diagnosis, Bailey & Love's Surgery, Tietz Textbook of Laboratory Medicine, and Schwartz's Principles of Surgery.
1. COMPLETE BLOOD COUNT (CBC)
Red Blood Cell Parameters
| Parameter | Normal Range | Low (Means...) | High (Means...) |
|---|---|---|---|
| Hemoglobin (Hb) | Male: 13.5-17.5 g/dL; Female: 12-16 g/dL | Anemia (iron deficiency, B12/folate def., chronic disease, hemolysis, blood loss) | Polycythemia vera, dehydration, high altitude, COPD |
| Hematocrit (Hct/PCV) | Male: 40-52%; Female: 36-48% | Same causes as low Hb | Polycythemia, dehydration |
| RBC Count | Male: 4.5-6.0 × 10⁶/μL; Female: 4.0-5.4 × 10⁶/μL | Anemia, hemorrhage | Polycythemia vera |
| MCV (Mean Corpuscular Volume) | 81-99 fL | Microcytic anemia (iron deficiency, thalassemia, sideroblastic anemia) | Macrocytic anemia (B12/folate deficiency, alcoholism, hypothyroidism, liver disease) |
| MCH | 30-34 pg | Hypochromic anemia (iron deficiency) | Macrocytic states |
| MCHC | 30-36 g/dL | Hypochromia (iron deficiency, thalassemia) | Hereditary spherocytosis |
| RDW-CV | 12-15% | (Normal RDW low is not clinically significant) | Mixed anemia, early iron/B12 deficiency, hemolytic anemia |
| Reticulocyte % | 0.5-1.5% | Aplastic anemia, bone marrow suppression | Hemolytic anemia, hemorrhage, response to treatment |
| Absolute Reticulocyte Count | 20,000-100,000/μL | Hypoproliferative marrow | Active hemolysis, acute blood loss |
White Blood Cell Parameters
| Parameter | Normal Range | Low | High |
|---|---|---|---|
| Total WBC | 4,000-11,000/μL | Leukopenia: viral infection, bone marrow suppression, aplastic anemia, SLE, drugs | Leukocytosis: bacterial infection, inflammation, leukemia, stress, steroids |
| Neutrophils | 40-70% (2,000-7,500/μL) | Neutropenia: viral infections, drugs, aplastic anemia, Felty's syndrome | Neutrophilia: bacterial infection, MI, burns, steroids, CML |
| Lymphocytes | 20-40% (1,500-4,000/μL) | Lymphopenia: HIV/AIDS, steroids, radiation, SLE | Lymphocytosis: viral infections (EBV, CMV), CLL, whooping cough |
| Monocytes | 2-8% (200-800/μL) | Rarely significant alone | Monocytosis: TB, infective endocarditis, monocytic leukemia, IBD |
| Eosinophils | 1-4% (100-400/μL) | Low eosinophils: acute infection, steroids | Eosinophilia: allergy, asthma, parasitic infections, Addison's disease, drug reactions, Loeffler's |
| Basophils | 0-1% (0-100/μL) | Rarely significant | Basophilia: CML, polycythemia, hypothyroidism, allergic reactions |
Platelet Parameters
| Parameter | Normal Range | Low (Thrombocytopenia) | High (Thrombocytosis) |
|---|---|---|---|
| Platelet Count | 150,000-400,000/μL | <150,000: ITP, TTP, DIC, hypersplenism, aplastic anemia, heparin-induced (HIT), viral infections | >400,000: reactive (infection, iron deficiency, post-splenectomy), essential thrombocytosis |
2. COAGULATION PROFILE
| Test | Normal Range | Prolonged (High) Means... |
|---|---|---|
| Prothrombin Time (PT) | 12-16 seconds | Warfarin therapy, Vitamin K deficiency, liver disease, DIC, factor deficiency (II, V, VII, X) |
| INR | 0.9-1.2 (therapeutic: 2.0-3.0 for anticoagulation) | Same as PT prolongation |
| aPTT (activated Partial Thromboplastin Time) | 25-35 seconds | Heparin therapy, hemophilia A & B (factor VIII/IX deficiency), DIC, lupus anticoagulant, Von Willebrand disease |
| Thrombin Time (TT) | 14-16 seconds | Fibrinogen deficiency, heparin, DIC |
| Fibrinogen | 200-400 mg/dL | High: acute phase reactant (infection, pregnancy). Low: DIC, fibrinolysis, severe liver disease |
| D-Dimer | <0.5 mg/L (or <500 ng/mL) | Raised in DVT, pulmonary embolism, DIC, recent surgery, sepsis, malignancy |
| Bleeding Time (BT) | 2-9 minutes | Thrombocytopenia, platelet dysfunction, Von Willebrand disease, aspirin use |
3. LIVER FUNCTION TESTS (LFTs)
Source: Bailey & Love's Surgery, 28th Edition
| Test | Normal Range | Abnormal Significance |
|---|---|---|
| Total Bilirubin | 5-17 μmol/L (0.3-1.2 mg/dL) | Elevated: hepatocellular damage, cholestasis, hemolysis. Jaundice clinically visible >35 μmol/L |
| Direct (Conjugated) Bilirubin | <0.3 mg/dL (<5 μmol/L) | Elevated: obstructive jaundice, hepatocellular disease, Dubin-Johnson/Rotor syndrome |
| Indirect (Unconjugated) Bilirubin | <1.0 mg/dL | Elevated: hemolysis, Gilbert's syndrome, Crigler-Najjar syndrome |
| AST (Aspartate Aminotransferase) | 5-40 IU/L | Elevated: hepatocellular damage, MI (less specific), muscle disease, alcoholic liver disease |
| ALT (Alanine Aminotransferase) | 5-40 IU/L | Elevated: liver-specific damage (hepatitis, NAFLD, drug-induced liver injury, cirrhosis) |
| GGT (Gamma-Glutamyl Transpeptidase) | 10-48 IU/L | Elevated: alcohol intake, cholestasis, liver disease, enzyme-inducing drugs (phenytoin, rifampicin) |
| ALP (Alkaline Phosphatase) | 30-140 IU/L | Elevated: cholestatic liver disease, biliary obstruction, Paget's disease, bone disorders, pregnancy |
| Albumin | 35-50 g/L (3.5-5 g/dL) | Low: chronic liver disease, malnutrition, nephrotic syndrome, protein-losing enteropathy, sepsis |
| Total Protein | 60-85 g/L (6-8.5 g/dL) | Low: malnutrition, liver failure, nephrotic syndrome. High: multiple myeloma, chronic infection |
| PT/INR | 12-16 sec / 0.9-1.2 | Prolonged: impaired synthetic liver function |
4. RENAL FUNCTION TESTS (RFTs/KFTs)
| Test | Normal Range | Abnormal Significance |
|---|---|---|
| Blood Urea Nitrogen (BUN) | 5-20 mg/dL (1.8-7.2 mmol/L) | Elevated: renal failure, dehydration, high protein diet, GI bleeding, catabolic states. Low: malnutrition, liver failure, pregnancy |
| Serum Creatinine | Male: 0.7-1.3 mg/dL; Female: 0.6-1.1 mg/dL | Elevated: acute/chronic kidney disease, muscle disease (rhabdomyolysis). Low: low muscle mass, malnutrition |
| BUN:Creatinine Ratio | 10:1 to 20:1 | >20:1: pre-renal azotemia (dehydration, reduced renal perfusion, GI bleed). <10:1: intrinsic renal disease, malnutrition |
| GFR (estimated) | >90 mL/min/1.73m² | <60 for >3 months = Chronic Kidney Disease (CKD). <15 = kidney failure |
| Uric Acid | Male: 3.4-7.0 mg/dL; Female: 2.4-6.0 mg/dL | Elevated (hyperuricemia): gout, tumor lysis syndrome, renal failure, diuretic use, psoriasis, leukemia |
5. SERUM ELECTROLYTES
| Electrolyte | Normal Range | Low (Causes) | High (Causes) |
|---|---|---|---|
| Sodium (Na⁺) | 135-145 mEq/L | Hyponatremia: SIADH, heart failure, cirrhosis, nephrotic syndrome, hypothyroidism, vomiting, diarrhea | Hypernatremia: dehydration, diabetes insipidus, excessive saline, Cushing's |
| Potassium (K⁺) | 3.5-5.0 mEq/L | Hypokalemia: vomiting, diarrhea, diuretics, alkalosis, hyperaldosteronism, Bartter syndrome | Hyperkalemia: renal failure, Addison's disease, ACE inhibitors, acidosis, crush injury (rhabdomyolysis) |
| Chloride (Cl⁻) | 96-106 mEq/L | Hypochloremia: vomiting, metabolic alkalosis, diuretics | Hyperchloremia: dehydration, renal tubular acidosis, excess NaCl infusion |
| Bicarbonate (HCO₃⁻) | 22-29 mEq/L | Low: metabolic acidosis (DKA, lactic acidosis, renal failure, diarrhea) | High: metabolic alkalosis (vomiting, excess antacid use, hyperaldosteronism) |
| Calcium (Ca²⁺) | 8.5-10.5 mg/dL (2.1-2.6 mmol/L) | Hypocalcemia: hypoparathyroidism, Vit D deficiency, renal failure, pancreatitis, hypomagnesemia | Hypercalcemia: hyperparathyroidism, malignancy (PTHrP), sarcoidosis, excess Vit D, Paget's disease, thiazides |
| Phosphate (PO₄³⁻) | 2.5-4.5 mg/dL | Hypophosphatemia: malnutrition, refeeding syndrome, hyperparathyroidism, Vit D deficiency, antacid abuse | Hyperphosphatemia: renal failure, hypoparathyroidism, rhabdomyolysis, excess Vit D |
| Magnesium (Mg²⁺) | 1.5-2.5 mg/dL (0.7-1.0 mmol/L) | Hypomagnesemia: malnutrition, chronic diarrhea, alcoholism, diuretics, DKA treatment | Hypermagnesemia: renal failure, excess supplementation, Addison's disease |
6. BLOOD GLUCOSE
| Test | Normal Range | Abnormal Significance |
|---|---|---|
| Fasting Blood Glucose | 70-100 mg/dL (3.9-5.6 mmol/L) | Prediabetes: 100-125 mg/dL. Diabetes: ≥126 mg/dL. Hypoglycemia: <70 mg/dL |
| 2-hr Postprandial Glucose | <140 mg/dL | Impaired: 140-199 mg/dL. Diabetes: ≥200 mg/dL |
| Random Glucose | <140 mg/dL (post-meal <200) | Diabetes diagnosed if ≥200 mg/dL with symptoms |
| HbA1c | <5.7% | Prediabetes: 5.7-6.4%. Diabetes: ≥6.5%. Target in treated diabetics: <7% |
7. THYROID FUNCTION TESTS
Source: Schwartz's Principles of Surgery, 11th Edition
| Test | Normal Range | Low | High |
|---|---|---|---|
| TSH (Thyroid Stimulating Hormone) | 0.4-4.0 mIU/L | Hyperthyroidism (primary), exogenous T4 excess | Hypothyroidism (primary), TSH-secreting pituitary tumor |
| Free T4 | 12-28 pmol/L (0.9-2.3 ng/dL) | Hypothyroidism | Hyperthyroidism, T4 toxicosis |
| Total T4 | 55-150 nmol/L (4.5-12 μg/dL) | Hypothyroidism, protein deficiency | Hyperthyroidism, pregnancy, estrogen therapy |
| Free T3 | 3-9 pmol/L (2.3-4.2 pg/mL) | Hypothyroidism, sick euthyroid syndrome | Hyperthyroidism, T3 toxicosis |
| Total T3 | 1.5-3.5 nmol/L (80-180 ng/dL) | Hypothyroidism | Hyperthyroidism (T3 thyrotoxicosis) |
8. CARDIAC BIOMARKERS
| Test | Normal Range | Elevated Means... |
|---|---|---|
| Troponin I | <0.04 ng/mL | Myocardial infarction (rises 3-6 hrs, peaks 12-24 hrs, stays up 7-10 days), myocarditis, PE, renal failure |
| Troponin T | <0.01 ng/mL | Same as above |
| CK-MB | <5% of total CK; <25 IU/L | MI (rises 3-6 hrs, peaks 12-24 hrs). Less specific than Troponin |
| Total CK (Creatine Kinase) | Male: 39-308 IU/L; Female: 26-192 IU/L | MI, rhabdomyolysis, muscular dystrophy, myositis, hypothyroidism |
| BNP / NT-proBNP | BNP <100 pg/mL; NT-proBNP <300 pg/mL | Heart failure (the higher, the worse), pulmonary hypertension, renal failure |
| LDH | 120-240 IU/L | Hemolysis, MI (historic use), liver disease, lymphoma, megaloblastic anemia |
9. LIPID PROFILE
| Parameter | Normal / Target | Abnormal Significance |
|---|---|---|
| Total Cholesterol | <200 mg/dL (desirable) | Borderline high: 200-239. High: ≥240. Risk for atherosclerosis, CAD |
| LDL Cholesterol | <100 mg/dL (optimal); <70 in high-risk pts | Elevated: major risk factor for CAD, atherosclerosis |
| HDL Cholesterol | Male: >40 mg/dL; Female: >50 mg/dL | Low: cardiovascular risk. High (>60): protective |
| Triglycerides | <150 mg/dL | Borderline: 150-199. High: 200-499. Very high: ≥500 (pancreatitis risk). Causes: DM, obesity, alcohol, hypothyroidism |
10. ARTERIAL BLOOD GAS (ABG)
| Parameter | Normal Range | Abnormal Significance |
|---|---|---|
| pH | 7.35-7.45 | <7.35 = Acidosis; >7.45 = Alkalosis |
| PaO₂ | 80-100 mmHg | <80 = Hypoxemia. Causes: pneumonia, PE, ARDS, pulmonary edema |
| PaCO₂ | 35-45 mmHg | <35 = Respiratory alkalosis (hyperventilation). >45 = Respiratory acidosis (COPD, respiratory failure) |
| HCO₃⁻ | 22-26 mEq/L | <22 = Metabolic acidosis (DKA, lactic acidosis). >26 = Metabolic alkalosis |
| SaO₂ | 95-100% | <95% = Hypoxemia requiring investigation |
| Base Excess | -2 to +2 mEq/L | Negative = metabolic acidosis. Positive = metabolic alkalosis |
11. URINE ANALYSIS (URINALYSIS)
| Parameter | Normal | Abnormal Significance |
|---|---|---|
| Color | Pale yellow | Dark yellow: concentrated urine/dehydration. Brown/tea-colored: hemoglobinuria, myoglobinuria, hepatitis. Red: hematuria, rifampicin |
| pH | 4.5-8.0 (typically ~6) | Acidic in metabolic acidosis, ketosis, high protein diet. Alkaline in UTI (Proteus), metabolic alkalosis |
| Specific Gravity | 1.003-1.030 | Low (<1.003): diabetes insipidus, overhydration. High (>1.030): dehydration, SIADH, glycosuria |
| Protein | Negative or trace (<150 mg/day) | Proteinuria: glomerulonephritis, nephrotic syndrome, DM nephropathy, pre-eclampsia, myeloma |
| Glucose | Negative | Glycosuria: diabetes mellitus, Fanconi syndrome (renal glycosuria) |
| Ketones | Negative | Ketonuria: DKA, starvation, prolonged fasting, alcoholism |
| Bilirubin | Negative | Bilirubinuria: obstructive/hepatocellular jaundice (not hemolysis - unconjugated bili doesn't pass in urine) |
| Urobilinogen | 0.2-1.0 EU/dL | Elevated: hemolysis, hepatocellular disease. Absent: complete biliary obstruction |
| Blood (Hematuria) | Negative | Urinary tract infection, stones, tumor, glomerulonephritis, trauma |
| WBC/pus cells | <5/hpf | Pyuria: UTI, pyelonephritis, TB of urinary tract |
| RBC | 0-2/hpf | >3/hpf = hematuria: glomerulonephritis, stones, tumor, trauma |
| Casts | Occasional hyaline casts | RBC casts: glomerulonephritis. WBC casts: pyelonephritis. Granular casts: ATN. Waxy casts: advanced CKD |
12. IRON STUDIES
| Test | Normal Range | Abnormal Significance |
|---|---|---|
| Serum Iron | Male: 60-170 μg/dL; Female: 50-150 μg/dL | Low: iron deficiency anemia, chronic disease. High: hemochromatosis, hemosiderosis, hemolysis |
| TIBC (Total Iron Binding Capacity) | 250-370 μg/dL | High: iron deficiency (body makes more transferrin). Low: chronic disease, malnutrition |
| Transferrin Saturation | 20-50% | <20%: iron deficiency. >50%: hemochromatosis, hemosiderosis |
| Serum Ferritin | Male: 12-300 ng/mL; Female: 12-150 ng/mL | Low (<12): iron deficiency (most sensitive marker). High: hemochromatosis, liver disease, chronic inflammation, malignancy (acute phase reactant) |
13. INFLAMMATORY MARKERS
| Test | Normal Range | Elevated Means... |
|---|---|---|
| ESR (Erythrocyte Sedimentation Rate) | Male: <15 mm/hr; Female: <20 mm/hr (Westergren) | Infection, inflammation, malignancy, anemia, pregnancy, autoimmune diseases (SLE, RA, TB, multiple myeloma) |
| CRP (C-Reactive Protein) | <5 mg/L | Bacterial infection (rises faster and falls faster than ESR), acute inflammation, post-surgery, MI |
| hsCRP (high-sensitivity CRP) | <1.0 mg/L (low cardiovascular risk) | 1-3 mg/L = moderate risk; >3 mg/L = high cardiovascular risk |
| Procalcitonin | <0.1 ng/mL | >0.5 ng/mL suggests bacterial sepsis; useful to guide antibiotic therapy |
14. COMMON SERUM PROTEINS
| Test | Normal Range | Abnormal Significance |
|---|---|---|
| Total Protein | 6.0-8.0 g/dL | Low: malnutrition, malabsorption, liver disease, nephrotic syndrome. High: dehydration, multiple myeloma |
| Albumin | 3.5-5.0 g/dL | Low (hypoalbuminemia): malnutrition, liver cirrhosis, nephrotic syndrome, chronic infection, third-spacing |
| Globulin | 2.0-3.5 g/dL | High: chronic infections, autoimmune disease, multiple myeloma |
| A/G Ratio | 1.2-2.2 | Low: liver disease, nephrotic syndrome, multiple myeloma |
15. PANCREATIC ENZYMES
| Test | Normal Range | Elevated Means... |
|---|---|---|
| Serum Amylase | 40-140 IU/L | Acute pancreatitis (rises in 2-12 hrs, returns to normal in 3-5 days), parotitis, bowel obstruction, renal failure |
| Serum Lipase | 10-140 IU/L | Acute pancreatitis (more specific and stays elevated longer than amylase), pancreatic pseudocyst |
16. HORMONES (Key Ones for MBBS)
| Hormone | Normal Range | Clinical Significance |
|---|---|---|
| Cortisol (morning 8 AM) | 5-25 μg/dL (138-690 nmol/L) | Low: Addison's disease, adrenal insufficiency. High: Cushing's syndrome, stress, obesity |
| ACTH | 10-60 pg/mL | Low + low cortisol: secondary adrenal insufficiency. High + low cortisol: primary Addison's |
| Insulin (fasting) | 2-25 μIU/mL | Elevated: insulinoma, insulin resistance, PCOS. Low: type 1 DM |
| Prolactin | Male: <18 ng/mL; Female: <25 ng/mL | Elevated: prolactinoma, hypothyroidism, antipsychotics, metoclopramide, stress, renal failure |
| Growth Hormone (fasting) | <5 ng/mL | Elevated: acromegaly (adults), gigantism (children). Low: dwarfism, GH deficiency |
| LH/FSH | Vary by phase and sex | Elevated FSH + LH: primary gonadal failure. Low: secondary hypogonadism (pituitary/hypothalamic cause) |
| Testosterone (male) | 300-1000 ng/dL | Low: hypogonadism, Klinefelter's, hypothalamic/pituitary disease |
17. CEREBROSPINAL FLUID (CSF) NORMAL VALUES
| Parameter | Normal | Abnormal Significance |
|---|---|---|
| Appearance | Clear, colorless | Turbid/cloudy: bacterial meningitis. Xanthochromic (yellow): old hemorrhage, jaundice |
| Pressure | 70-180 mmH₂O | Elevated: meningitis, raised ICP, hydrocephalus. Low: CSF leak |
| WBC | 0-5 cells/μL (lymphocytes) | Neutrophils: bacterial meningitis. Lymphocytes: viral/TB/fungal meningitis |
| Protein | 15-45 mg/dL | Elevated: meningitis, Guillain-Barre, MS, brain tumor. Very high (>500): TB meningitis, bacterial meningitis |
| Glucose | 50-80 mg/dL (or 60-70% of serum glucose) | Low: bacterial/TB/fungal meningitis. Normal in viral meningitis |
| Chloride | 120-130 mEq/L | Decreased in TB meningitis (historically noted) |
18. QUICK MNEMONIC SUMMARY FOR MBBS
"CARTS" for anemia workup:
- CBC + retics, Appearance on smear, RBC indices (MCV), Transferrin/iron studies, Serum B12/folate
ABG interpretation (ROME mnemonic):
- Respiratory Opposite: pH↑ = PaCO₂↓ (alkalosis); pH↓ = PaCO₂↑ (acidosis)
- Metabolic Equal: pH↑ = HCO₃↑; pH↓ = HCO₃↓
Sources:
- Goldman-Cecil Medicine, Table 144-2: Normal Red Blood Cell Measurements
- Henry's Clinical Diagnosis and Management by Laboratory Methods
- Bailey & Love's Short Practice of Surgery, 28th Ed., Table 69.1
- Schwartz's Principles of Surgery, 11th Ed. - Thyroid reference ranges
- Tietz Textbook of Laboratory Medicine, 7th Ed.
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