Indirect (unconjugated) bilirubin is bilirubin that has not yet been processed by the liver.
- Normal range (adults)
- Up to 1 mg/dL (up to 17.1 µmol/L)
- Sample
- Blood
- Fasting
- Not usually needed
- Also called
- Unconjugated Bilirubin, I.Bilirubin, Indirect Bili, IBIL, Bilirubin Indirect
Indirect Bilirubin normal range
| Group | mg/dLConventional units: US, South Asia | µmol/LSI units: UK, Europe, Australia, international |
|---|---|---|
| Adults | Up to 1 | Up to 17.1 |
Your report may use either unit system; labs in the Gulf often print both. Ranges also vary slightly between laboratories, so the range printed on your own report is the one to go by.
Why is the Indirect Bilirubin test done?
It helps identify Gilbert's syndrome and red-cell breakdown.
What does a high Indirect Bilirubin level mean?
High indirect bilirubin usually means Gilbert's syndrome or faster breakdown of red blood cells.
Common causes
- Gilbert's syndrome
- Hemolytic anemia
- G6PD deficiency (after certain foods or medicines)
- Newborn jaundice
Diet and lifestyle tips
- Avoid long fasting if you have Gilbert's syndrome
- Stay hydrated
- If you have G6PD deficiency, avoid fava beans and medicines your doctor lists
When should you see a doctor?
If other liver tests and blood counts are normal, Gilbert's syndrome is the usual explanation; confirm with your doctor.
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This page is for general education and is not a diagnosis. Normal ranges differ between laboratories, so always compare your result with the reference range printed on your own report, and discuss abnormal results with your doctor.