Liver
Indirect Bilirubin
LOINC 1971-1 · mg/dL
Ranges
Reference range: 0.1–0.9 mg/dL
What it is
Indirect (unconjugated) bilirubin is the form before the liver has processed it. It comes from the normal breakdown of red blood cells.
Why it matters
A raised indirect bilirubin can point to faster red-cell breakdown or a common, harmless variation in liver processing.
What high values can mean
A higher value can reflect increased red-cell breakdown (hemolysis) or Gilbert syndrome, a benign inherited variation.
What low values can mean
A lower value is normal and not a concern.
How to improve it
When due to Gilbert syndrome no treatment is needed; otherwise care addresses the cause of red-cell breakdown.
Food & lifestyle
No specific food changes it; in Gilbert syndrome, staying hydrated and not skipping meals can reduce mild rises.
Preparing for the test
Part of a bilirubin or liver panel; fasting is sometimes requested — follow your lab.
When to talk to a doctor
Discuss a raised indirect bilirubin with a doctor, who will check for hemolysis or Gilbert syndrome.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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