Definition: yellowish brown pigment that is formed by the breaking down of old or damaged red blood cells. An accumulation of bilirubin in the blood is called "jaundice," which indicates medical problems involving the liver, bile ducts and possibly the pancreas.
Bilirubin
By Lisa Fayed, About.com
Updated: January 12, 2009
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
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