Individual tests

Bilirubin is a substance produced when old red blood cells are broken down. It mainly exists in two forms in the blood, unconjugated or indirect bilirubin, and conjugated or direct bilirubin. Typically, your liver removes most of the substance from your body. If your liver is damaged or red blood cells are being destroyed faster than normal, excess bilirubin is released into the bloodstream, which can cause your skin and eyes to turn yellow. If jaundice is suspected, a bilirubin blood test can help determine if there is liver disease or hemolysis.

Bilirubin is a substance made during the breakdown of old red blood cells and mainly exists in two forms in the blood, unconjugated or indirect bilirubin, and conjugated or direct bilirubin. Indirect bilirubin will be converted into direct bilirubin by your liver. A blockage in the liver or bile duct is often the cause of an increase in direct bilirubin.

GGT is an enzyme found throughout the body, especially the liver. If your liver is damaged, GGT may leak into the bloodstream. High levels of GGT in the blood may be a sign of liver disease or damage to the bile ducts.