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Bilirubin (formerly referred to as haematoidin) is the yellow breakdown product of normal heme catabolism, caused by the body's clearance of aged red blood cells which contain hemoglobin.Bilirubin is excreted in bile and urine, and elevated levels may indicate certain diseases.ilirubin (formerly referred to as haematoidin) is the yellow breakdown product of normal heme catabolism, caused by the body's clearance of aged red blood cells which contain hemoglobin.
Fast facts. 1  A bilirubin test is used to help determine the cause of jaundice, a yellowing of your skin and the whites of your eyes. 2  It helps diagnose conditions like liver disease, hemolytic anemia, and blocked bile ducts. 3  Normal values of total bilirubin range from 0.3â1.0 mg/dL.