MetabolicHepatology

Bilirubin (Total And Direct)

Normal Range
Total: 0.1-1.2, Direct: 0.0-0.3 mg/dL
Sample Type
Serum
Fasting
Required
Unit
mg/dL

Function

Bilirubin is a yellowish pigment made during the normal breakdown of red blood cells (hemoglobin). Total Bilirubin is the sum of Unconjugated (Indirect) and Conjugated (Direct) bilirubin. The liver processes indirect bilirubin into direct bilirubin so it can be excreted in bile.

Why it is Ordered

This test is a staple of Liver Function Tests (LFTs). It is used to investigate jaundice (yellowing of skin/eyes), monitor liver disease (hepatitis, cirrhosis), check for blockages in the bile ducts (gallstones), and evaluate for hemolytic anemia (accelerated destruction of red blood cells).

Associated Conditions

  • Gilbert's Syndrome: A benign genetic condition causing mild elevations in indirect bilirubin.
  • Hepatitis: Inflammation of the liver affecting bilirubin processing.
  • Choledocholithiasis: Gallstones blocking the common bile duct, raising direct bilirubin.
  • Hemolytic Anemia: Conditions like Sickle Cell or G6PD deficiency that flood the system with bilirubin.

Check Your Result

Check Your Result

Interactive
mg/dL

Enter your lab result to see where you stand compared to the standard reference range.

Why Context Matters

Bilirubin is extremely light-sensitive; if the blood vial is left under fluorescent light for too long, bilirubin levels can drop significantly (false low). High-fat meals or prolonged fasting (ironically) can also skew results. Furthermore, many medications (like certain antibiotics or birth control) can artificially elevate levels.

Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.

Clinical References

Source-of-truth databases and clinical guidelines for Bilirubin (Total And Direct):

Research & Guidelines

Related Indicators

Lipid Profile

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Urine Bicarbonate

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Albumin

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DR

Medically Reviewed by Dr. Binoy Babu, MBBS

Board Certified Doctor • 10+ Years Clinical Experience

Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.

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