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Sample Page

The page below is a sample from the MediaLab course, Chemical Screening of Urine by Reagent Strip (retired March 2012).

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Urobilinogen

Urobilinogen is a byproduct of hemoglobin breakdown. It is produced in the intestinal tract as a result of the action of bacteria on bilirubin. Almost half of the urobilinogen produced recirculates through the liver and then returns to the intestines through the bile duct. Urobilinogen is then excreted in the feces where it is converted to urobilin. As the urobilinogen circulates in the blood to the liver, a portion of it is diverted to the kidneys and appears as urinary urobilinogen. Up to 1 mg/dL or Ehrlich unit of urobilinogen is present in normal urine. A result of 2.0 mg/dL represents the transition from normal to abnormal and the patient should be evaluated further. It is important to note that the reagent strip cannot determine the absence of urobilinogen.

 

 

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