What Are Bilirubin and Bile?
When a person is in good health, the bile pigment* bilirubin is formed from the normal breakdown of hemoglobin (HE-mo-glo-bin), which is the oxygen-carrying substance in red blood cells. This process occurs naturally as old red blood cells wear out and are replaced in the body. Bilirubin is then carried in the bloodstream to the liver, where it is combined with bile.