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Urobilin

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Urobilin is a bile pigment derived from bilirubin via the intermediate urobilinogen. It is water soluble and imparts a brown colour to faeces.

Urobilinogen is formed:

  • by partial oxidation of urobilinogen during transit along the bowel
  • by oxidation within urine of urobilinogen

Hence, urobilin is found within both faeces and urine. Urinary losses may be up to 5mg/day in a healthy adult.

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