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Osmolality, Serum
Test CodeOSM
Preferred Specimen
1 mL serum
Minimum Volume
0.5 mL
Transport Container
Transport tube
Transport Temperature
Refrigerated (cool packs)
Specimen Stability
Refrigerated: 3 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Grossly lipemic • Grossly icteric • Heparinized plasma
Methodology
Freezing Point Depression
Setup Schedule
24/7
Report Available
Same day
Reference Range
0-59 years: 275-295 mOsm/kg
60 years +: 280-301 mOsm/kg
Clinical Significance
For the evaluation of fluid and electrolyte balance.
