Gilbert-Lereboullet syndrome is a mild genetic liver disorder in which the body can’t properly process bilirubin, a yellowish waste product made when old or worn-out red blood cells are broken down (hemolysis). People with Gilbert syndrome have high bilirubin levels called hyperbilirubinemia. It is because they have less of a specific liver enzyme needed to get rid of bilirubin.
Moreover, most people who have it don’t have any symptoms or only mild ones, like yellowing skin, mucous membranes, and whites of the eyes. Also, Gilbert syndrome may not be apparent until adolescence.