Serum Osmolality
Info
Na
unit mg/dL mmol/L
BUN
unit mg/dL mmol/L
Glucose
unit mg/dL mmol/L
R e s u l t s
mOsm/kg serum H20
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Info
Serum Osmolality
 

Serum Osmolality (Calculated) in mOsm/kg serum H20=

(2 * Na) + (BUN/2.8) + (Glu/18)

 

Na in mEq/L; BUN & Glu in mg/dL.

 

Normal= 285-295 mOsm/kg H20  

The formula accounts for the most prevalent normally present osmotically active solutes

 

Used to categorize hyponatremias and with measured serum osmolality to calculate Osmolal Gap.