Bilirubin - Direct, Serum Test
The Bilirubin - Direct, Serum test measures the level of direct (conjugated) bilirubin in the blood. Bilirubin is a yellow pigment produced during the normal breakdown of red blood cells. Direct bilirubin is processed by the liver and excreted through bile. This test helps evaluate liver function and detect liver or bile duct disorders.
Why is this test done?
Doctors may recommend this test to:
- Assess liver health and function
- Diagnose jaundice and its cause
- Detect bile duct obstruction
- Monitor liver diseases such as hepatitis or cirrhosis
- Evaluate hemolytic disorders and gallbladder conditions
Symptoms that may require testing
- Yellowing of skin or eyes (jaundice)
- Dark-colored urine
- Pale stools
- Abdominal pain
- Fatigue or weakness
- Nausea and loss of appetite
Sample Required
-
Sample Type: Serum
-
Preparation: Usually no fasting required unless advised by your doctor
Normal Range
Normal values may vary slightly depending on the laboratory method used.
Interpretation
-
High Direct Bilirubin: May indicate liver disease, bile duct blockage, hepatitis, or gallstones
-
Low Levels: Generally not clinically significant
