Serum Osmolality (US) = (2 * (Na) + (BUN / 2.8) + (glucose / 18) +
(ethanol/4.6);
SI units ares all molar, so no need to divide by 2.8 or
18 or 4.6.
Normal serum osmolality = 285-295 mOsm/kg
Normal Serum Osm Gap (Measured-Calculated) is -14 to +10.
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