what is an osmol gap
From Wikipedia, the free encyclopedia. (Redirected from Serum osmolal gap). Osmol gap (or osmolal gap, or osmolality gap, or osmole gap) in medical science is the difference between measured serum osmolality and calculated serum osmolality.1  1 Theory.rom Wikipedia, the free encyclopedia. (Redirected from Serum osmolal gap). Osmol gap (or osmolal gap, or osmolality gap, or osmole gap) in medical science is the difference between measured serum osmolality and calculated serum osmolality.