Bilirubin
A breakdown product of red blood cells processed by the liver.
What is it
Bilirubin is produced from the breakdown of red blood cells and processed by the liver for excretion. Total bilirubin includes both direct (conjugated) and indirect (unconjugated) forms.
Why it's measured
Elevated bilirubin has been associated with liver dysfunction, bile flow obstruction, and increased red blood cell breakdown in published research.
Reference range
Standard laboratory reference
0.2 – 1.2 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.
Where does your number land?
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Drag to your own Total Bilirubin result.
Educational only, not a diagnosis. Ranges vary by laboratory. See which panel includes Total Bilirubin.
What results may indicate
Elevated
Has been associated with liver and bile duct conditions, hemolysis, and Gilbert's syndrome in research literature.
Lower
Is generally not clinically concerning.
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
Part of standard liver panels.
Related markers
Common questions
Bilirubin is produced from the breakdown of red blood cells and processed by the liver for excretion. Total bilirubin includes both direct (conjugated) and indirect (unconjugated) forms.
It's one of the markers used to build a fuller picture of your health. On its own it tells you very little, so it's most informative when reviewed alongside related markers.
It's measured from a standard blood draw at Quest or LabCorp. Total Bilirubin is one of the markers included in the OPTML Apex Panel, where your results are read across systems and reviewed by a U.S.-licensed physician.
Reference ranges vary by laboratory, and a single value rarely tells the whole story. Review your result with a physician in the context of your other markers, symptoms, and history.
Total Bilirubin is one signal among many. Answer a few quick questions and we’ll point you to the panel that fits.
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.
Find the right 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.
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