Reducing substances faeces
5 g faeces.
Spot test; chromatography.
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Diagnosis of sugar intolerance:lactose, sucrose or glucose/galactose.
Although the test is usually done with faecal pH measurement the latter does not provide any additional useful diagnostic information.
A positive result indicates reduced digestion or absorption of one or more sugars.
False negatives occur eg, if the offending sugar has not been ingested recently.
Kerry KR and Anderson CM. Lancet 1964; 1: 981.