pH - faeces

Last updated: Sunday, 21, March, 2004

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Item Process
Specimen

5 g faeces.

Method

pH electrode.

Reference Interval
5-9.
Application

Limited value in the diagnosis of sugar intolerance.

Unabsorbed sugars are fermented by bacteria in the large bowel to acids which lower faecal pH.

Faecal pH may be measured in association with faecal reducing substances. The test is, however, non-specific.

Interpretation

Low faecal pH in a person ingesting the suspected sugar supports the diagnosis of sugar intolerance.

Reference

Varley H. Practical Clinical Biochemistry. 5th ed. William Heinemann 1980.