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Urobilinogen is a yellow by-product of bilirubin reduction. It is formed in the intestines by the bacterial enzyme bilirubin reductase. [ 1 ] About half of the urobilinogen formed is reabsorbed and taken up via the portal vein to the liver, enters circulation and is excreted by the kidney.
Urobilinogen: 0.2 [2] 1.0 [2] Ehrlich units or mg/dL Free catecholamines, dopamine: 90 [3] 420 [3] μg/d Red blood cells (RBCs) 0 [4] [2] 2 [2] - 3 [4] per High Power Field (HPF) RBC casts: n/a 0 / negative [2] White blood cells (WBCs) 0 [2] 2 [2] pH: 5 [2] 7 [2] (unitless) Protein: 0: trace amounts [2] Glucose: n/a: 0 / negative [2] Ketones: n ...
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. [1] [2] Some of this remains in the large intestine, and its conversion to stercobilin gives feces their brown color. Some is ...
Part of the urobilinogen is reabsorbed in the intestine then circulated in the blood to the liver where it is excreted. A small part of this recirculated urobilinogen is filtered out by the kidneys and appears in urine (less than 1 mg/dL urine). The stercobilinogen can not be reabsorbed and remains in the intestine. [15] [16]
Urobilinogen refers to a group of compounds produced from bilirubin by the intestinal flora. Under normal conditions, most of the urobilinogen produced is absorbed into the bloodstream and secreted into the bile by the liver, or excreted in the feces as stercobilin and other compounds. A small fraction is excreted in the urine.
Ehrlich's reagent or Ehrlich reagent is a reagent containing p-dimethylaminobenzaldehyde (DMAB) and thus can act as an indicator to presumptively identify indoles and urobilinogen. Several Ehrlich tests use the reagent in a medical test; some are drug tests and others contribute to diagnosis of various diseases or adverse drug reactions.
Enterohepatic circulation of drugs. Enterohepatic circulation is the circulation of biliary acids, bilirubin, drugs or other substances from the liver to the bile, followed by entry into the small intestine, absorption by the enterocyte and transport back to the liver.
The increase of stercobilin (urobilin) in the feces and urine is caused by the enhanced intracellular hemolysis of erythrocytes. Formed an unconjugated bilirubin entering the intestine, gives a large number of stercobilinogen (urobilinogen). Last absorbed into the blood and passes into the urine. [citation needed]