OSMOLALITY, SERUM

Specimen Required
Draw blood in a plain red-top. Centrifuge, separate, and send 1.0 mL serum (0.2 mL minimum) room temperature in a screw-capped plastic vial.

Alternate Specimen
Serum: SST

Methodology
Freezing Point Depression

Stability
Room Temperature: 7 days; Refrigerated: 7 days; Frozen: 28 days

Reference Range
278 - 305 mOsm/kg

Performed
Monday, Wednesday, Friday

Turnaround Time4-6 days
Test CodeSOSMQ
CPT-4 Code (s)
83930
LOINC Codes
2692-2

Warde
Medical
Laboratory