Osmolality

Test Code

LAB107

Alias/See Also

1231100263

CPT Codes
83930

Includes

OSMOLALITY

Preferred Specimen

Gold SST (Gel separator preferred)

Minimum Volume

0.5 mL serum

Instructions

Specimen must be centrifuged within 2 hours after collection and serum pulled off cells.

Specimen Stability

Room Temperature: 2 hours
Refrigerated: 3 days

Methodology
Osmo Pro Max

Reference Range

Males/Females:
0-1 Day: 366-299 mos/kg
1-2 Days: 258-289 mos/kg
2 Days-18 Years: 270-285 mos/kg
Adults: 270-295 mos/kg

Performing Laboratory
FORT SMITH LABORATORY LITTLE ROCK LABORATORY

Last Updated: August 26, 2026

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.