Bilirubin

Bilirubin is a dark yellow waste product primarily created when the body breaks down hemoglobin from aged red blood cells. It is found in bile, a fluid generated in your liver. Bilirubin is stored in the gallbladder and is involved in digesting food. Most bilirubin is eliminated in the feces or urine.

The bilirubin test checks the health of your liver by measuring the amount of bilirubin in your blood or urine. This can help diagnose or monitor problems related to your liver or red blood cells when the bilirubin level is too high.