Osmolar Gap
(Last Updated - 11/22/2006)

-the form below uses the equation:

Osmolar Gap =

(Measured Serum Osmolarity) - (Calculated Serum Osmolarity)

     Where Calculated Serum Osmolarity =
     [2 * (Na+)] + (Glucose / 18) + (BUN / 2.8) + (Ethanol / 4.6)


Measured Serum Osmolarity (mOsm/kg):
Serum Na+ (mEq/L):       
Serum Glucose (mg/dL):
Serum BUN (mg/dL):      
Serum Ethanol (mg/dL): 
     ***Converting % to mg/dL:***
             0.053 % = 53 mg/dL

Osmolar Gap (Before Ethanol Correction):


Osmolar Gap (After Ethanol Correction):


(Normal osmolar gap after correction < 10)


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References: