Days Set Up
Analytic Time

8 hours

MiChart Code
pH, Stool
Soft Order Code

Test Updated:


Fecal pH
Stool pH

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Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

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Test Overview

Test Methodology

colorpHast pH-indicator strips

Test Usage

Stool pH less than 5.5 is indicative of carbohydrate absorption abnormality. Low stool pH also contributes to excoriation of perianal skin as commonly seen with profuse diarrhea. Slightly alkaline pH may occur in cases of secretory diarrhea without food intake, colitis, villous adenoma, and possibly with antibiotic usage. High stool pH may be associated with colorectal cancer.

Reference Range

6.5 - 7.5

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

Collect a random stool specimen and place at least 3 mL in a clean plastic container. Refrigerate up to 24 hours or freeze for longer storage. Liquid or solid stool is acceptable; do not add saline or water to liquefy sample. Diapers containing stool are not acceptable; stool must be transferred from a diaper to a closed container at the collection site. Stool contaminated with urine is unacceptable. Containers contaminated externally with stool specimen are not acceptable.

100ml Plastic Specimen Container
Normal Volume
3 mL stool
Minimum Volume

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.