Direct Bili
The water-soluble bilirubin processed by the liver.
What is it
Direct (conjugated) bilirubin is the form that has been processed by the liver and is water-soluble. Elevation specifically points toward bile flow or hepatocellular issues.
Why it's measured
Elevated direct bilirubin has been associated with bile flow obstruction and certain hepatocellular conditions in research literature.
Reference range
Standard laboratory reference
0 – 0.3 mg/dL
Reference ranges vary by laboratory. Your individual reference range will appear on your test report and should be interpreted by your physician in the context of your overall health profile.
What results may indicate
Elevated
Has been associated with bile duct obstruction and hepatocellular conditions in research literature.
Lower
Is generally considered favorable.
These associations are general. They are not a personal diagnosis or prediction. Discuss your individual results with your physician in the context of your full health profile.
When it's measured
Reported alongside total bilirubin.
Related markers
Measured in
A complete look at your heart, hormones, metabolism, inflammation, and longevity systems — drawn at Quest or LabCorp, reviewed by a U.S.-licensed physician.
Explore the Apex Panel →This information is for general educational purposes only and is not medical advice. Lab results alone are not intended to diagnose, treat, or cure any condition and do not replace the advice of a healthcare provider. OPTML does not offer medical advice, a diagnosis, medical treatment, or any form of medical opinion.