Liver
Direct Bilirubin
LOINC 1968-7 · mg/dL
Ranges
Reference range: 0–0.3 mg/dL
What it is
Direct (conjugated) bilirubin is the form the liver has already processed, ready to be removed in bile.
Why it matters
A raised direct bilirubin points to problems with bile flow or the liver's ability to excrete it.
What high values can mean
A higher value can reflect blocked bile ducts or liver conditions that impair excretion.
What low values can mean
A lower value is normal and not a concern.
How to improve it
Care targets the liver or bile-duct cause; the value follows that, not lifestyle.
Food & lifestyle
No specific food changes it; supporting overall liver health is the broader aim.
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 direct bilirubin with a doctor, especially with jaundice or pale stools.
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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