Anion Gap Calculator
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Na (mEq/L)
Cl (mEq/L)
HCO3 (mEq/L)
R e s u l t s
Anion Gap in mEq/L
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Anion Gap Calculator
 

Anion Gap in mEq/L =

[Na] - ([Cl] + [HCO3])

 

Normal: 12 ± 4 mEq/L

 

Provides indirect measure of serum anions not routinely measured

Helps categorize acidoses.

 

Gap acidoses: salicylates, uremic,methanol, paraldehyde, lactic,ethylene glycol, ketoacidosis

 

Nongap acidoses: carbonic anhydrase inhibitor, RTA, ureteral diversions,diarrhea/GI HCO3 losses.