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Serum Osmolality

Sodium (Na): mmol/L
(optional)Potassium (K): mmol/L
BUN: mg/dl
Glucose: mg/dl
Serum Osmolality = mOsm/kg
Normal Range = 285 - 295 mOsm/kg
Serum Osmolality = (2 x (Na + K)) + (BUN / 2.8) + (glucose / 18)