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Test Code UREDF Reducing Substance, Feces

Reporting Name

Reducing Substance, F

Useful For

Assisting in the differentiation between osmotic and nonosmotic diarrhea

 

Screening test for:

-Diarrhea from disaccharidase deficiencies, (eg, lactase deficiency)

-Monosaccharide malabsorption

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Fecal


Specimen Required


Supplies: Stool container, Small (Random), 4 oz Random (T288)

Container/Tube: Fecal container

Specimen Volume: 3 g

Collection Instructions:

1. Collect a loose, unpreserved, random fecal specimen.

2. Freeze immediately.

Additional Information: If additional tests are ordered, aliquot and separate sample prior to freezing to allow 1 container per test.


Specimen Minimum Volume

2 g

Specimen Stability Information

Specimen Type Temperature Time
Fecal Frozen 7 days

Reference Values

Negative or trace

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information

84376

LOINC Code Information

Test ID Test Order Name Order LOINC Value
UREDF Reducing Substance, F 11060-1

 

Result ID Test Result Name Result LOINC Value
6215 Reducing Substance, F 11060-1

Cautions

This test has poor sensitivity for oligosaccharides.

 

Antibiotics can alter the intestinal flora and affect acid production.

 

False-positive reactions due to drugs (salicylates, penicillin, ascorbic acid, nalidixic acid, cephalosporins, and probenecid) are possible.

 

Feces may be contaminated with urine, in which case glycosuria will give false-positive results.

 

Diaper collections can be falsely decreased as the fluid portion containing water soluble sugars is absorbed into the diaper.

 

Bacteria in specimen consumes sugars resulting in falsely decreased values. Specimen should be frozen within 30 minutes of collection.

Reject Due To

Urine and feces mixed
Feces collected in any preservative or fixative		 Reject

NY State Approved

Yes

Method Name

Benedict's Copper Reduction Reaction

Forms

If not ordering electronically, complete, print, and send a Gastroenterology and Hepatology Test Request (T728) with the specimen.

Secondary ID

607696

Day(s) Performed

Monday through Saturday

Report Available

1 to 3 days