Bilirubin - blood
Alternate Names : Total bilirubin - blood, Unconjugated bilirubin - blood, Indirect bilirubin - blood, Conjugated bilirubin - blood, Direct bilirubin - blood
- Direct bilirubin: 0 to 0.3 mg/dL
- Total bilirubin: 0.3 to 1.9 mg/dL
Note: mg/dL = milligrams per deciliter
Normal values may vary slightly from laboratory to laboratory.
What do Abnormal Results Mean?
Jaundice is a yellowing of the skin and the white part of the eye, which occurs when bilirubin builds up in the blood at a level greater than approximately 2.5 mg/dL. Jaundice occurs because red blood cells are being broken down too fast for the liver to process. This might happen due to liver disease or bile duct blockage.
If the bile ducts are blocked, direct bilirubin will build up, escape from the liver, and end up in the blood. If the levels are high enough, some of it will appear in the urine. Only direct bilirubin appears in the urine. Increased direct bilirubin usually means that the biliary (liver secretion) ducts are obstructed.
Increased indirect or total bilirubin may be a sign of:
Increased direct bilirubin may indicate:
Additional conditions under which the test may be performed: