pH, Feces

Test Code

CPT Codes

Preferred Specimen
5 grams liquid stool collected in a plastic screw-cap container

Minimum Volume
1 gram

Other Acceptable Specimens
Random stool collected in a plastic screw-cap container

Random stool specimen, collected in sterile, plastic, leak-proof container or stool specimen container with spork (Warehouse # 77000). Adult and older pediatric patients can collect the specimen by passing feces into plastic wrap stretched loosely over the toilet bowl. Then transfer 5 grams of the stool specimen into the plastic container. With young children and infants wearing diapers, the diaper should be lined with clean plastic wrap to prevent absorption. A pediatric urine bag can be attached to the child to ensure that the stool specimen is not contaminated with urine. Then transfer 5 grams of the stool specimen from the plastic-lined diaper to the plastic container. Do not submit the diaper itself. Freeze and transport frozen.

Transport Temperature

Specimen Stability
Room temperature: 4 hours
Refrigerated: 24 hours
Frozen: 60 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Received thawed • Specimens received in paint cans


Setup Schedule
Set up: Sun-Fri; Report available: 2 days

Reference Range
5.92 - 8.00 pH units

Clinical Significance
As a screen for carbohydrate and fat malabsorption, and is also used to evaluate small intestinal disaccharidase deficiencies.

Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.