Serum Osmolality - Calculator
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Na (mEq/L)
Glucose (mg/dL)
BUN (mg/dL)
R e s u l t s
Serum Osmolal Gap in mOsm/kg
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Serum Osmolality - Calculator

The serum osmolal gap is the difference between the measured and calculated serum osmolality

Formula:

serum osmolality = 2 x [Na+] (in mEq/L) + (Glucose in mg/dL / 18) + (BUN in mg/dL / 2.8)