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Test Code PH ST Stool pH

Clinical System Name

Stool pH


Feces - pH

Feces pH

Stool - pH

Stool pH


Fecal pH and fecal reducing substances are useful measurements in the diagnosis of intestinal disacchariadase deficiency. The stools are usually acid having a pH of 5.5 or less due to increased excretion of lactic acid.

Sample Requirements

Specimen:  Stool

Container(s): Sterile Screw-Capped Container (No diapers).

Preferred Vol: 1 gram stool

Minimum Vol: 1 gram stool


Note: Deliver to the Lab within 2 hours of specimen collection.


Processing Instructions

Reject due to: Insufficient quantity of stool, stools sent in diapers, stool diluted with urine.

Spin: N

Aliquot: N

Temp: 2-8oC

Storage location: Core 5 Chemistry Refrigerator


Off-site collection:  Collect specimen in Sterile Screw-Capped Container. Deliver to the Lab within 2 hours of specimen collection.



Specimen Type Temperature Time
Stool RT

 4 H

Stool Refrigerated

 4 H





STAT Performed TAT
Y 24/7 1 H


Performing Laboratory

Seattle Children's Laboratory    


Department:  Core Chemistry

Phone Number206-987-2617

Reference Range


Age Normal
1 D -  > 18 Y 5.5 - 7.5




Nitrazine (sodium dinitro-phenylazonaphthol disulfonate) as an indicator dye.


Analytical Volume: 0.10 mL

CPT Codes