Anion Gap Calculator

   
   

Na 
Cl 
HCO3 

The anion gap is the difference between primary measured cations (sodium Na+ and potassium K+) and the primary measured anions (chloride Cl- and bicarbonate HCO3-) in serum.

Formula

Anion Gap in mEq/L =[Na] - ([Cl] + [HCO3])
Normal: 12 (+/-) 4 mEq/L