What does urobilirubin mean?

Urobilinogen is a colorless byproduct of bilirubin reduction, primarily produced in the intestines by the action of gut bacteria. It is formed from bilirubin, which is derived from the breakdown of hemoglobin in red blood cells. Urobilinogen is normally excreted in urine and can be oxidized to urobilin, giving urine its characteristic yellow color. Elevated or decreased levels of urobilinogen in urine can indicate various liver or hemolytic disorders.