Osmolality, Serum, McLendon Clinical Laboratories | UNC Medical Center, Hospitals

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Effective Jan. 5, 2026: Temporary Age-Based Visitor Restrictions at UNC Health for all inpatient and waiting areas throughout its inpatient hospitals.

Tube Type

Test ID		LAB107
EPIC Order		OSMOLALITY, SERUM
CPT Code(s)		83930
Group/Individual Test		Individual
Laboratory		Core Laboratory
Tube Station		Routine 30; STAT 888
Specimen	Routine:	2 mL blood/gold SST tube/red plain tube, or green lithium heparin gel tube also acceptable.
	Micro:	500 µL blood/gold SST microtainer
Stability		Unspun - 3 hrs Spun Room Temperature - 3 hrs Spun Refrigerated - 4 days Spun Frozen - 4 days
Availability		24 hrs/day
Turnaround Time	Routine:	2 hrs
	STAT:	1 hr
Reference Range	Normal:	275-295 mOsm/kg H₂O

Reviewed by J. Carr on January 10, 2026

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514