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Osmolal Gap

Source Blood
Mnemonic OG
Specimen Requirements

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

1.0 mL heparinized plasma or serum

Specimen Handling
Additional Information Ogap = measured osmolality – calculated osmolality

The Osmolal Gap is no longer used as a screening test for volatiles ie. Methanol, Isopropanol, Ethylene Glycol
Testing Location Chemistry-Acute Care
Testing Frequency Daily
Alternate Name(s)
Reference Interval