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Osmolal gap is the difference between measured serum osmolality and calculated serum osmolality.
Additional recommended knowledge
It is typically calculated as: OG = measured serum osmolality - (2 X serum sodium + [[blood sugar|serum glucose]/18] + serum [[urea]/2.8/])
In US customary units the calculated osmolarity is: ( 2 x sodium ) + glucose/18 + BUN/2.8.
A normal osmolal gap is < 12 mmol/L.
Causes of an elevated osmolal gap are numerous. Noted causes are:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Osmolal_gap". A list of authors is available in Wikipedia.|