Reducing Substances, Feces, Qualitative

Sunquest Code:SREDS  
Synonyms:Fecal Reducing Substances; Glucose, Fecal
Methodology:Glucose oxidase reagent strip, copper reduction reagent tablet, pH paper.
CPT Code:81002
Test Includes:pH and reducing substances
Turnaround Time:Performed 7 days/week; results are reported the same day.
Special Instructions:Specimen should be frozen if testing cannot be completed within one hour of collection. Bacterial fermentation will result in falsely low results if the specimen is left at room temperature.

Collection Instructions

Optimal Volume:5 mL liquid specimen
Minimum\Peds Volume:1 mL
Collection Instructions:Usually liquid (diarrheal) feces is used for testing unless formula modifications are being tracked with serial fecal specimens. Deliver to laboratory within one hour of collection.

Processing and Shipping

Specimen Processing:Store in freezer.
Shipping Instructions:Ship on dry ice.
Test Performed at or Referral Lab Urinalysis  (UMMC-West Bank)


Reference Range:



Normal Diet:

Neutral to slightly alkaline (7.0-7.5)

Breast Fed Infants:

Slightly acid

Bottle fed infants:

Neutral to slightly alkaline






Reducing Substances:

Normal:            Less than 250 mg/dL

Borderline:      250-500 mg/dL

Abnormal:       Greater than 500 mg/dL



Use:Screening test to detect carbohydrate malabsorption due to deficiencies of lactase, sucrase or maltase in infants with diarrhea or failure to thrive. Carbohydrate malabsorption results in increased excretion of reducing sugars (>0.5 g/dL) and decreased pH (<6). Reduction of stool pH is found in infants more often than adults.

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