Osmolality, Stool

Test Code

Quest Code

CPT Codes

Preferred Specimen
1 mL random watery liquid fecal collected in a plastic screw-cap container or 24-hour or 48-hour watery liquid fecal collected in a plastic screw-cap container

Minimum Volume
0.2 mL

Specimen must be shipped frozen to reduce the odor during shipping and to minimize the risk of the container rupturing due to gas accumulation.

Note: This test only has clinical utility if performed on a watery fecal specimen.
Stable up to 3 freeze-thaw cycles

Transport Temperature

Specimen Stability
Room temperature: Unacceptable
Refrigerated: 48 hours
Frozen: 60 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Specimens in paint cans • Formed stool • Specimens received room temperature • Specimens received refrigerated

Freezing Point Depression

Setup Schedule
Set up: Sun-Fri; Report available: 3 days

Reference Range
Not established

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.