What is the typical normal range for direct bilirubin?

What is the typical normal range for direct bilirubin?

• A. 0.0-0.3 mg/dL
• B. 0.1-0.6 mg/dL
• C. 0.5-1.0 mg/dL
• D. 0.0-0.1 mg/dL

Answer: (A)

Direct bilirubin is the conjugated form of bilirubin that the liver excretes into bile, so in a healthy person this fraction is quite small. The typical normal range for direct bilirubin is 0.0 to 0.3 mg/dL. Values above this suggest possible issues with bile flow or liver processing, such as cholestasis or hepatocellular injury. The range 0.0-0.3 mg/dL matches standard lab references, while ranges that go higher (like 0.6 or 1.0 mg/dL) or are too narrow (0.0-0.1 mg/dL) don’t reflect the usual small but present amount of conjugated bilirubin in the blood.

Direct bilirubin is the conjugated form of bilirubin that the liver excretes into bile, so in a healthy person this fraction is quite small. The typical normal range for direct bilirubin is 0.0 to 0.3 mg/dL. Values above this suggest possible issues with bile flow or liver processing, such as cholestasis or hepatocellular injury. The range 0.0-0.3 mg/dL matches standard lab references, while ranges that go higher (like 0.6 or 1.0 mg/dL) or are too narrow (0.0-0.1 mg/dL) don’t reflect the usual small but present amount of conjugated bilirubin in the blood.