Bilirubinuria is a pathological condition characterized by the presence of bilirubin in the urine. The causes are diseases of the liver and biliary tract (BI). A high concentration of bilirubin stains the urine dark brown. The test for bilirubinuria together with the test for urobilinogenuria (detection of bilirubin derivatives in the urine) is used for the differential diagnosis of jaundice - parenchymal, hemolytic, obstructive. Treatment of the underlying disease is necessary to correct bilirubinuria.