What is a bilirubin blood test?A bilirubin blood test measures the levels of bilirubin in your blood. Bilirubin is a yellowish substance made during the body's normal process of breaking down red blood cells. Bilirubin is found in bile, a fluid in your liver that helps you digest food. If your liver is healthy, it will remove most of the bilirubin from your body. If your liver is damaged, bilirubin can leak out of your liver and into your blood. When too much bilirubin gets into the bloodstream, it can cause jaundice, a condition that causes your skin and eyes to turn yellow. Signs of jaundice, along with a bilirubin blood test, can help your health care provider find out if you have liver disease.Other names: Total serum bilirubin, TSB
