The breakdown of red blood cells (RBCs) in the body produces bilirubin. The RBCs have a lifespan of around 120 days, and they renew continually. RBCs contain hemoglobin, which helps transport ...

Under normal conditions, bilirubin formed from the catabolism of heme is taken up and conjugated by the liver, secreted into the bile and then transported through the bile ducts to the duodenum.

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.