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Test Code OSM Osmolality, Plasma or Serum

Performing Laboratory

Lima Memorial Health System Laboratory

Specimen Requirements

Preferred:
Container/Tube: Green cap-yellow ring Top (Lithium Heparin Gel) tube
Minimum Volume: 1.0 mL 
Collection Instructions: Centrifuge within 2 hours.
Also Acceptable:
Container/Tube: Plain, Red Top or Serum gel (SST-Gel) tube

Reference Values

270-300 mosm/kg H2O

Specimen Stability

Ambient: 24 hours
Refrigerate: 48 hours

Day(s) Test Set Up

Monday through Sunday

Methodology

Freezing Point Depression

Test Classification and CPT Coding

83930