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Reducing Substances, stool

Item Value
Approval req'd? No
Available Stat? No
Test code RSST
Test group Reducing substances
Performed by Parnassus & Mission Bay Hematology
In House Availability Run 0800-1600 daily.
Method copper reduction
Container type Clean container
Amount to Collect See preferred volume
Sample type Fresh liquid stool
Preferred volume 10 gm
UCSF Rejection Criteria Formed stool received.
Units mg/dL
Normal range < 500 mg/dL
Synonyms Acid hydrolysis; Reducing sugars; Disaccharide deficiency; stool analysis
Turn around times 1 day.
Additional information Reducing substances, if present, are reported semiquantitatively as equivalent to the activity of 0 (negative), 250, 500, 750, 1000, 2000 or > 2000 mg/dL of glucose (these correspond to the formerly used readings of negative, trace, 1+, etc.).

Although sucrose is not a reducing sugar it is extensively hydrolyzed by stool flora to the reducing sugars glucose and fructose and thus is detected in the assay for reducing substances in stool.

Acid hydrolysis to detect stool sucrose is unnecessary and will not be done.

See also pH, stool
CPT coding 84999
Last Updated 6/21/2016 14:09:57
Entry Number 813
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