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Osmolality - Blood

Source Blood
Mnemonic OSM
Specimen Requirements

1 x 3 mL light green (mint) top PST tube.  Gold top SST tube also acceptable.

1.0 mL plasma or serum

Minimum Whole Blood Volumes for Microcollections

Specimen Handling
Additional Information Calculated Osmolality = 2Na (mmol/L) + Urea (mmol/L) + Glu (mmol/L)
Testing Location Chemistry-ACH, FMC, PLC, RGH, SHC
Testing Frequency Daily
Alternate Name(s)
Reference Interval

280 - 300 mmol/kg

Click here for critical values.