What are some reasons for elevated bilirubin?

Elevated bilirubin levels may indiciate that a patient's liver isn't able to break down bilirubin efficiently, reports the Mayo Clinic. Higher than average levels may also occur if a patient has a blocked bile duct or a medical condition known as Gilbert's Syndrome.

Doctors check bilirubin levels in a patient's blood in order to determine the health and wellness of his liver, explains the Mayo Clinic. If a person's bilirubin levels are too high or too low, he may have a blockage in one of his liver ducts, a form of liver disease, jaundice or some form of drug toxicity.