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Osmolal Gap

Source Blood 
Mnemonic OG 
Specimen Requirements

1 x 5 mL light green (mint) top PST tube.  Gold top SST tube is also acceptable.

1.0 mL heparinized plasma or serum

 
Specimen Handling  
Additional Information Ogap = measured osmolality – calculated osmolality 
Testing Location Chemistry-Acute Care 
Testing Frequency Daily 
Alternate Name(s)  
Reference Interval  


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