Reducing substances - faeces

Last updated: Thursday, 25, March, 2004

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Item Process
Specimen

5 g faeces.

Method

Spot test; chromatography.

Reference Interval

Negative.

Application

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.

Interpretation

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.

Reference

Kerry KR and Anderson CM. Lancet 1964; 1: 981.