Direct Bilirubin (Conjugated)

Elevated when the liver or bile ducts are the primary problem.

What it is

Direct (conjugated) bilirubin is the water-soluble form processed by the liver. When this fraction is disproportionately elevated, it points to intra- or extra-hepatic bile duct obstruction or hepatocellular damage.

Why it matters

Distinguishing direct vs. indirect bilirubin elevation helps localise the cause. Direct elevation → liver or bile duct issue. Indirect elevation → pre-hepatic (e.g., haemolysis). This distinction guides the next clinical steps.

How to test

Included in detailed liver function panels.

This information is for educational purposes only. Always discuss testing and interpretation of results with your care team.

Optimal range

Below 5 µmol/L normal.

How often

When total bilirubin is elevated, or as part of liver function monitoring during treatment.