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St. John Health System
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Index:

Osmolality Serum/Plasma

Order Name OSMO
Test Number: 2004300
Revision Date 01/23/2013
Test Name Methodology LOINC Code
Osmolality Serum/Plasma
Freezing Point 2692-2 
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1 mL (0.5) Plasma Lithium Heparin PST (Light Green Top) Refrigerated
Alternate 1 1 mL (0.5) Serum Clot Activator SST Refrigerated
Instructions Specimen stability: Ambient 8 hours. Refrigerated 7 days. Frozen 4 weeks.
GENERAL INFORMATION
Testing Schedule Daily 
Expected TAT 1-2 days 
Clinical Use Used in the investigation of hyponatremia and potential poisoning. 
CPT Code(s) 83930
Service Provided By Labcorp Oklahoma, Inc.
Lab Section Chemistry