medicine symptom and investigation for jaundice

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Jaundice: Symptoms and Investigations

Definition

Jaundice (icterus) is the yellowish staining of the skin, sclera, and mucous membranes caused by elevated serum bilirubin. It becomes clinically detectable when serum bilirubin rises above 2.5-3 mg/dL (normal: 0.3-1.0 mg/dL). Hyperbilirubinemia arises from overproduction of bilirubin, impaired uptake/conjugation/excretion, or regurgitation from damaged hepatocytes or bile ducts. - Harrison's Principles of Internal Medicine 22E, p. 366

Classification by Mechanism

Type	Bilirubin	Cause Location
Pre-hepatic	Unconjugated (indirect)	Before liver - excess bilirubin production
Hepatic (intrahepatic)	Mixed	Within liver - hepatocellular damage or cholestasis
Post-hepatic	Conjugated (direct)	After liver - biliary obstruction

Symptoms

General Symptoms (All Types)

Yellow discoloration of skin, sclera (best seen in natural light), and mucous membranes
Dark urine (bilirubinuria - tea/cola colored) - indicates conjugated hyperbilirubinemia
Pale/clay-coloured stools (acholic stools) - indicates obstructed bile flow
Pruritus (itching) - from bile salt deposition in skin; commonly accompanies cholestatic jaundice

Symptoms by Cause

Pre-hepatic (Hemolytic):

Pallor (anemia)
Splenomegaly
No dark urine, no pale stools (unconjugated bilirubin not excreted in urine)
Family history of hemolytic disorders (sickle cell, thalassemia, spherocytosis)

Hepatic (Hepatocellular):

Fatigue, malaise, anorexia
Nausea, vomiting
Right upper quadrant (RUQ) discomfort or pain
Fever (viral hepatitis, alcoholic hepatitis)
Signs of liver failure: spider nevi, palmar erythema, gynecomastia, asterixis (flap), encephalopathy
History of alcohol use, drugs, blood transfusions, IV drug use, sexual exposure
Weight loss (in malignancy)

Post-hepatic (Obstructive):

Painless jaundice - classic presentation of pancreatic head cancer / periampullary tumors
Painful jaundice with fever and rigors - Charcot's triad of ascending cholangitis (stones)
Courvoisier's sign: palpable, non-tender gallbladder (suggests malignant obstruction)
Steatorrhea (malabsorption of fat due to lack of bile in duodenum)
Weight loss in malignancy
Dark urine and pale stools prominent

Key clinical distinction: Conjugated (direct) bilirubin crosses into urine giving dark urine. Unconjugated (indirect) bilirubin is albumin-bound and does NOT appear in urine.

Investigations

Step 1 - Baseline Blood Tests (First Line for All Patients)

Test	Purpose
Serum bilirubin (total, direct, indirect)	Quantify jaundice; determine conjugated vs unconjugated
ALT / AST (transaminases)	Hepatocellular injury pattern
ALP / GGT (alkaline phosphatase)	Cholestatic pattern
Prothrombin time (PT/INR)	Synthetic function of liver
Serum albumin	Chronic liver disease marker
Full blood count (FBC/CBC)	Hemolysis, infection, thrombocytopenia (hypersplenism)

Interpreting the Pattern

Hepatocellular pattern: ALT/AST elevated out of proportion to ALP
Cholestatic pattern: ALP elevated out of proportion to ALT/AST
Isolated unconjugated hyperbilirubinemia: Think hemolysis, Gilbert's, Crigler-Najjar
Isolated conjugated hyperbilirubinemia: Think Dubin-Johnson, Rotor syndrome

Step 2 - Further Tests Based on Pattern

A. If Unconjugated Hyperbilirubinemia (Pre-hepatic / Hemolytic Pattern)

Peripheral blood smear - spherocytes, sickle cells, schistocytes
Reticulocyte count - elevated in hemolysis
Coombs test (direct antiglobulin) - positive in immune-mediated hemolysis
LDH, haptoglobin - LDH elevated, haptoglobin decreased in hemolysis
Hemoglobin electrophoresis - sickle cell, thalassemia

Gilbert's syndrome: Mild unconjugated hyperbilirubinemia (<6 mg/dL), worsened by fasting/illness/stress, affects 3-7% of population, benign condition. - Harrison's 22E

Crigler-Najjar Type I: Severe unconjugated jaundice (>20 mg/dL) in neonates due to complete absence of bilirubin-UDPGT; kernicterus common.

B. If Hepatocellular Pattern (ALT/AST predominant)

Viral serologies:
- Hepatitis A IgM
- Hepatitis B surface antigen (HBsAg) + HBc IgM
- Hepatitis C RNA (HCV RNA)
- Hepatitis E IgM (if indicated - developing countries)
- CMV DNA, EBV capsid antigen (if initial screen negative)
- Hepatitis D antibody (if HBV positive)
Toxicology screen - paracetamol/acetaminophen level
Ceruloplasmin and 24-hr urine copper - Wilson's disease (if patient <40 years)
Autoimmune markers:
- ANA (antinuclear antibody)
- SMA (smooth muscle antibody)
- Anti-LKM1 (liver-kidney microsomal antibody)
- SPEP (serum protein electrophoresis) - elevated IgG in autoimmune hepatitis
Liver biopsy - if above investigations are negative

C. If Cholestatic Pattern (ALP predominant) - Ultrasound First

Abdominal ultrasound is the essential FIRST imaging step
- If bile ducts are dilated → extrahepatic cholestasis → proceed to CT/MRCP/ERCP
- If bile ducts are NOT dilated → intrahepatic cholestasis
  - Check: AMA (anti-mitochondrial antibody) for Primary Biliary Cholangitis (PBC)
  - Hepatitis serologies, drugs review
  - If AMA positive → liver biopsy
  - If AMA negative → MRCP + liver biopsy

Step 3 - Imaging

Modality	Role
Abdominal Ultrasound	First-line; detects dilated ducts, gallstones, liver lesions, cirrhosis
CT abdomen (with contrast)	Better for pancreatic lesions, malignancy staging
MRCP (MR Cholangiopancreatography)	Non-invasive biliary tree imaging - best for choledocholithiasis, PSC, strictures
ERCP	Invasive; diagnostic AND therapeutic (stone extraction, stenting)
Liver biopsy	Definitive histological diagnosis when non-invasive tests inconclusive

Ultrasound is excellent for biliary pathology and focal lesions; inexpensive, widely available, no radiation. Limitations include incomplete visualization with obesity and overlying bowel gas. - Schwartz's Principles of Surgery, 11E

Diagnostic Flowchart

Here is the evidence-based diagnostic approach (Harrison's 22E, Fig. 52-1):

Flowchart from Harrison's Principles of Internal Medicine 22E - showing the step-by-step approach from bilirubin fractionation to liver biopsy

Common Causes Summary

Category	Examples
Pre-hepatic	Hereditary spherocytosis, sickle cell disease, thalassemia, G6PD deficiency, autoimmune hemolysis, malaria
Hepatic - Inherited	Gilbert's syndrome, Crigler-Najjar (unconjugated); Dubin-Johnson, Rotor (conjugated)
Hepatic - Acquired	Viral hepatitis (A, B, C, D, E), alcoholic liver disease, drug-induced (paracetamol, INH, rifampicin), autoimmune hepatitis, Wilson's disease, ischemic hepatitis
Post-hepatic - Benign	Choledocholithiasis (most common extrahepatic cause), primary sclerosing cholangitis (PSC), strictures
Post-hepatic - Malignant	Pancreatic head carcinoma (classic painless jaundice), cholangiocarcinoma, ampullary carcinoma, gallbladder carcinoma

In developing countries, infections (viral hepatitis, malaria, leptospirosis, typhoid) remain the leading cause of jaundice. In developed countries, drugs and extrahepatic biliary obstruction are more common. - Harrison's 22E

Sources: Harrison's Principles of Internal Medicine 22E (Ch. 52) | Schwartz's Principles of Surgery 11E | Sleisenger & Fordtran's Gastrointestinal and Liver Disease

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