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Test Code LAB4151 OSMOLALITY

Specimen Type

Preferred Specimen: Serum Tube (SST, Gold, Corvac, Tiger, Red Top Tube)
Alternate Specimen:  Lithium Heparin Plasma (Mint Green Top, Dark Green)

Specimen Volume

2 mL

Minimum Volume

1.0 mL

Turnaround Time

STAT: 1 hour
Routine: 4 hours

Test Schedule

Daily

Sample Stability

2 days Refrigerated or Room Temperature

Method

Freezing Point

Reference Ranges

Serum Osmolality: 275-295 mOsm/kg

Reporting Range: 0-2000 mOsm/kg H20

 

CPT Codes

83930

Test Components

Osmolality, mOsm/kg.

Specimen Processing

Micro-samples are more susceptible to contamination and evaporation that larger samples. Avoid leaving sample containers (small or large) open dureing testing. Always cap immediately after sampling.

Cold samples are susceptible to condensation; warmer samples are susceptable to evaporation. Make sure body fluid is at room temperature prior to testing.