Test Code OSMO Osmolality, Plasma or Serum
Additional Codes
St. Luke's Compendium Code (Iatric): L303.1250
Performing Laboratory
St. Lukes Hospital Laboratory
Methodology
Freezing Point
Specimen Requirements
Submit only 1 of the following specimens:
PlasmaDraw blood in a green-top (lithium heparin) plasma
gel tube(s). Spin down and send 1 mL of lithium heparin plasma
refrigerated.
Note: 1. Indicate plasma on request
form.
2. Label specimen appropriately (plasma).
Serum
Draw blood in a serum gel tube(s). Spin down and send 1 mL of serum
refrigerated.
Note: 1. Indicate serum on request form.
2. Label specimen appropriately (serum).
Unspun specimens must be transported at ambient temperature and arrive to the laboratory within one hour of draw.
Reference Values
278-301 mOsm/kg
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
CPT: 83930
LOINC: 2692-2