Bilirubin (Direct)
Direct (conjugated) bilirubin has been processed by the liver, making it water-soluble for excretion in bile. It represents bilirubin that has successfully passed through liver conjugation but may not be reaching the intestine due to obstruction or liver cell dysfunction.
Why it matters: Raised direct bilirubin points toward the liver or bile flow rather than red-cell breakdown — it has already been processed by the liver, so it relates to how the liver excretes bilirubin or how bile is flowing. It is often investigated further with imaging.
May increase with:
May decrease with:
What is Bilirubin (Direct)?
Direct (conjugated) bilirubin has been processed by the liver, making it water-soluble for excretion in bile. It represents bilirubin that has successfully passed through liver conjugation but may not be reaching the intestine due to obstruction or liver cell dysfunction.
What might a high or low Bilirubin (Direct) mean?
Raised direct bilirubin points toward the liver or bile flow rather than red-cell breakdown — it has already been processed by the liver, so it relates to how the liver excretes bilirubin or how bile is flowing. It is often investigated further with imaging.
What is the typical reference range for Bilirubin (Direct)?
The general-population reference range shown here is < 5 umol/L. Reference ranges describe the general population and are not a personal target — discuss your results with your physician.
What can affect Bilirubin (Direct)?
It may be higher with: Bile duct obstruction (gallstones, tumors, strictures), Hepatitis (viral, autoimmune, drug-induced), Cirrhosis, Cholestatic medications, Sepsis, Dubin-Johnson syndrome (benign genetic). It may be lower with: Relieving bile duct obstruction, Treating hepatitis, Stopping causative medications, Improving liver function.
Track your Bilirubin (Direct) over time
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