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In medicine, bilirubinuria is an abnormality in which conjugated bilirubin is detected in the urine. [1] The term "biliuria" is very similar, but more general. It refers to the presence of any bile pigment in the urine. Conjugated bilirubin is detected in urine at bilirubinemia of approximately 30-34 mmol/L or 2 mg/dL.
Conjugated bilirubin is normally stored in the gallbladder as a constituent of bile and is excreted through the intestines; it does not occur at detectable levels in the urine. [81] The presence of bilirubin in the urine (termed bilirubinuria) occurs as a consequence of high blood levels of conjugated bilirubin in liver disease or bile duct ...
Bilirubin (BR) (from the Latin for "red bile") is a red-orange compound that occurs in the normal catabolic pathway that breaks down heme in vertebrates.This catabolism is a necessary process in the body's clearance of waste products that arise from the destruction of aged or abnormal red blood cells. [3]
In biliary obstruction, below-normal amounts of conjugated bilirubin reach the intestine for conversion to urobilinogen. With limited urobilinogen available for reabsorption and excretion, the amount of urobilin found in the urine is low. High amounts of the soluble conjugated bilirubin enter the circulation where they are excreted via the kidneys.
Results from the urine test should be confirmed by a complete blood count (CBC) and serum testing for total serum bilirubin and fractionated bilirubin. [32] Increased reticulocytes and the presence of schistocytes in the blood smear of the patient observed during CBC indicates hemolysis . [ 28 ]
Dark-colored urine could indicate advanced NAFLD. This occurs when the liver cannot filter waste products effectively, increasing a yellow pigment called bilirubin. This compound is formed from ...
Foamy urine is considered a cardinal sign of proteinuria, but only a third of people with foamy urine have proteinuria as the underlying cause. [2] It may also be caused by bilirubin in the urine (bilirubinuria), [3] retrograde ejaculation, pneumaturia (air bubbles in the urine) due to a fistula, [4] or drugs such as pyridium. [3]
Urobilin is generated from the degradation of heme, which is first degraded through biliverdin to bilirubin. Bilirubin is then excreted as bile, which is further degraded by microbes present in the large intestine to urobilinogen. The enzyme responsible for the degradation is bilirubin reductase, which was identified in 2024.