Direct (conjugated) bilirubin is bilirubin that the liver has already processed and is ready to leave in bile.
- Normal range (adults)
- Up to 0.3 mg/dL (up to 5.1 µmol/L)
- Sample
- Blood
- Fasting
- Not usually needed
- Also called
- Conjugated Bilirubin, D.Bilirubin, Direct Bili, DBIL, Bilirubin Direct
Direct Bilirubin normal range
| Group | mg/dLConventional units: US, South Asia | µmol/LSI units: UK, Europe, Australia, international |
|---|---|---|
| Adults | Up to 0.3 | Up to 5.1 |
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 Direct Bilirubin test done?
It shows whether a high total bilirubin comes from the liver or bile ducts.
What does a high Direct Bilirubin level mean?
High direct bilirubin means bile is not draining properly, from liver disease or blocked bile ducts.
Common causes
- Gallstones blocking the bile duct
- Hepatitis
- Liver cirrhosis
- Some medicines
- Rarely, tumours pressing on the bile ducts
Diet and lifestyle tips
- Avoid alcohol
- Eat smaller, lower-fat meals
- Drink enough water
When should you see a doctor?
A raised direct bilirubin always needs medical review, usually with an ultrasound.
Last updated
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.