Bilirubin
Also called: Total bilirubin
Bilirubin is the yellow waste pigment from haemoglobin breakdown. Elevated levels cause jaundice and signal liver, bile-duct or haemolytic problems.
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What does Bilirubin measure?
When red blood cells die, their haem breaks down into bilirubin in the spleen. The liver picks up this unconjugated (indirect) bilirubin, attaches sugars to make it water-soluble — conjugated (direct) bilirubin — and excretes it into bile. Total bilirubin is the sum; the direct/indirect ratio tells you WHERE the problem is. Indirect-dominant rise means too much red-cell breakdown or trouble before liver conjugation (Gilbert's syndrome). Direct-dominant rise means trouble AFTER conjugation — bile flow obstruction or liver-cell injury.
What does a high Bilirubin level mean?
- Gilbert's syndrome — common benign genetic variant; mild indirect bilirubin rise especially after fasting or illness. No treatment needed.
- Haemolysis — accelerated red-cell breakdown; check reticulocyte count, LDH, haptoglobin.
- Hepatocellular injury — viral hepatitis, drug-induced, NAFLD progression; ALT/AST also elevated.
- Biliary obstruction — gallstones, tumour, primary biliary cholangitis, primary sclerosing cholangitis; alkaline phosphatase + GGT also elevated.
- Neonatal jaundice — physiological in newborns, but extreme levels carry kernicterus risk.
What does a low Bilirubin level mean?
- Generally not clinically significant — low bilirubin is benign.
- Some studies link low bilirubin to higher cardiovascular risk but this isn't actionable.
When to discuss with a doctor
Total bilirubin above 2 mg/dL (jaundice threshold) warrants a primary-care visit and additional labs — direct vs indirect breakdown, ALT/AST, alkaline phosphatase, GGT, ultrasound. Sudden jaundice with abdominal pain or fever may be biliary obstruction and needs urgent evaluation. Mediora.AI shows the bilirubin pattern in context with the other liver-panel markers.
Related markers
Commonly confused with
- Direct (conjugated) bilirubin The total is everything; the direct fraction is the part the liver has already processed. Which of the two is raised points in opposite directions: mostly indirect suggests red cells breaking down, mostly direct suggests the liver or the bile ducts.