bilirubin

Bilirubin is a yellowish substance produced when your body breaks down old red blood cells. Normally, it’s processed by the liver, which helps turn it into a form that can be safely eliminated through your urine and stool. When the liver isn’t working properly or there’s increased red blood cell breakdown, bilirubin can build up in the blood, leading to jaundice, which causes yellowing of the skin and eyes. Monitoring bilirubin levels helps healthcare providers assess liver function and diagnose related conditions.