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# Formula to calculate serum osmolarity

Updated: 4/28/2022

Wiki User

11y ago

Best Answer

Serum Osmolarity = 2 [Na] + [Glucose] + [BUN] (if all in mmol/L) OR

Serum Osmolarity = 2 [Na] + [Glucose]/18 + [BUN]/2.8 (if glucose and BUN are in mg/dl)

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11y ago
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