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Anion Gap

Serum sodium level (Na): mmol/L
(optional) Serum potassium level (K): mmol/L
Serum chloride level (Cl): mmol/L
Serum bicarbonate level (HCO3): mmol/L
 

Anion Gap = mmol/L
Normal Anion Gap:
Anion gap = (Na + K) - (Cl + [HCO3-])
(all units mmol/L)