What Is a Bilirubin Test? A bilirubin test measures the amount of bilirubin in your blood. It's used to help find the cause of health conditions like jaundice, anemia, and liver disease.

When red blood cells die, they leave behind bilirubin, a yellow-orange pigment in the blood. The liver filters bilirubin from the bloodstream to be removed in your stool. If too much is in your ...