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HelpTest 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
0.5 mL
Turnaround Time
STAT: 1 hour
Routine: 4 hours
Test Schedule
Daily
Sample Stability
Refrigerated: 1 week
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.
Method
Freezing Point
Reference Ranges
Serum Osmolality: 273-304 mOsm/kg
Measuring Range: 0-2000 mOsm/kg H20
Reporting Range: 0-2000 mOsm/kg H20
Test Components
Osmolality, mOsm/kg.
CPT Codes
83930