Question: why is urine urobilinogen increased in unconjugated hyperbilirubinemia?
Answer: HEMOLYSIS. Hemolysis causes unconjugated hyperbilirubinemia. There is no bilirubinuria because unconjugated bilirubin is not hydrophilic and cannot be excreted in the urine. There is increased urobilinogen in the urine because more bilrubin reaches the intestine and more urobilinogen is formed an reabsorbed.