Serum Osmolality
Calculate osmolality and osmolal gap.
Lab Values
mEq/L
Serum sodium
mg/dL
Serum glucose
mg/dL
Blood urea nitrogen
mOsm/kg
From lab (for gap calculation)
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Calculated Osmolality
0 mOsm/kg
Osmolal Gap: 0 mOsm/kg
Normal Gap
Calculated
0 mOsm/kg
Measured
295 mOsm/kg
Gap
0 mOsm/kg
Normal Gap
<10
Formula
Osm = (2 × Na) + (Glucose/18) + (BUN/2.8)
= (2 × 140) + (100/18) + (20/2.8) = 0 mOsm/kg
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