Stool (or faecal) reducing substances is a stool sample test used to diagnose lactose intolerance (and some rare metabolic abnormalities). Lactose intolerance can be caused by a prolonged or severe episode of viral gastroenteritis.
Sugars (e.g, glucose, galactose, fructose, maltose, lactose, and pentose) are characterized as reducing substances based on their ability to reduce cupric ions to cuprous ions.
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