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Liver Function (LFTs)

Bilirubin, Direct (Conjugated)

Normal range 0–0.3 mg/dL (0–5.1 µmol/L SI). Specimen: Serum.

Also known as: conjugated bilirubin, Dbili.

0–0.3 mg/dLReference range

Reference range

Conventionalmg/dL
00.3
SIµmol/L
05.1
SpecimenSerum
Conventional range0–0.3 mg/dL
SI range0–5.1 µmol/L
Conversion factor×17.1 (conventional → SI)
PanelLiver Function (LFTs)

Convert any Bilirubin, Direct (Conjugated) result between units on the unit converter.

What is the normal range for Bilirubin, Direct (Conjugated)?

The standard teaching reference range for Bilirubin, Direct (Conjugated) is 0–0.3 mg/dL in conventional units, or 0–5.1 µmol/L in SI units. This value is measured in serum.

Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population — always use the range printed on the actual result.

Above the range

Common causes of a high Bilirubin, Direct (Conjugated)

  • Biliary obstruction
  • Hepatitis
  • Drug-induced cholestasis

At the bedside

Nursing considerations

  • A high direct fraction points to a hepatobiliary (post-hepatic) cause of jaundice.

Study aid

Your notes on Bilirubin, Direct (Conjugated)

Same panel

More Liver Function (LFTs) tests

Alanine Aminotransferase (ALT)7–56 U/LAlbumin, Serum3.5–5 g/dLAlkaline Phosphatase (ALP)44–147 U/LAmmonia15–45 µg/dLAspartate Aminotransferase (AST)10–40 U/LBilirubin, Total0.3–1.2 mg/dL