People with Gilbert syndrome have approximately 30 percent of normal bilirubin-UGT enzyme function. As a result, unconjugated bilirubin is not glucuronidated quickly enough.

Gilbert’s syndrome can be diagnosed using a blood test to measure the levels of bilirubin in your blood and a liver function test.

While Gilbert’s syndrome is considered harmless, it is clinically important because it may give rise to a concern about a blood or liver condition.

Most people with Gilbert’s syndrome experience short-lived episodes of jaundice due to the build-up of bilirubin in the blood.