Medical Calculator – SonDoctor.com
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Osmolality Calculator

Calculated Osm = (2 × Na) + (glucose / 18) + (BUN / 2.8)
Effective Osm = (2 × Na) + (glucose / 18)
(BUN crosses cell membranes freely and has minimal osmotic effect)
Osmolar gap = Measured Osm – Calculated Osm