Correction on the serum osmolality formula information
Glucose should be divided by 18. So it should be (2 x Na) + (glucose/18) + (BUN / 2.8) source: Kaplan 2003, p.41
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Kristian Joseff
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This would be necessary if glucose was in mg/dL and you’d need to convert it to mmol/L. However the formula as given states that glucose already is in mmol/L.