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Login or RegisterThis test measures direct (conjugated) bilirubin levels in the blood to help evaluate liver function, bile duct obstruction, and causes of jaundice.
• Fasting Required: No
• Preferred Specimen: 1 mL serum
• Turnaround Time: 1 business day
• Reference Range(s): See Laboratory Report
• Draw Site: Quest PSC
Quest Code: 285
The Direct Bilirubin Test measures levels of conjugated bilirubin in your blood to assess liver and gallbladder function. Direct (or “conjugated”) bilirubin is processed by the liver and excreted through the bile ducts. Elevated levels may indicate bile duct obstruction, liver damage, or impaired bile flow.
Doctors commonly order this test to:
This test is often used alongside total and indirect bilirubin tests to help differentiate between liver disease, hemolysis, or bile flow obstruction. It is also useful in newborns with prolonged jaundice to rule out serious conditions like biliary atresia.
The Direct Bilirubin Test offers valuable insights into liver health and supports early diagnosis, better treatment planning, and improved patient outcomes.