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Urinary reducing substances

Authoring team

Urinary reducing substances can be identified by a positive clinitest reaction (blue to orange). Substances associated with a positive reaction include:

  • glucose
  • galactose
  • lactose
  • pentose
  • homgentisic acid
  • drugs associated with a positive reaction include salicylates, levodopa, ascorbic acid, nalidixic acid, tetracyclines

Specific glucoses tests (e.g. Diastix) are only positive for glucose but may be inhibited by the presence of levodoa, ketones, or ascorbic acid.


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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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