Bilirubin levels can be used to identify liver damage/disease or to monitor the progression
of jaundice. Increased total or unconjugated (indirect) bilirubin may be a result
of hemolytic, sickle cell or pernicious anemias or a transfusion reaction. If conjugated(direct) bilirubin is elevated, there may be some kind of blockage of the liver or bile ducts, hepatitis, trauma to the liver, cirrhosis, a drug reaction, or long-term alcohol abuse...."
From: http://www.labtestsonline.