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Anion Gap Calculator

Anion Gap

Formula

Anion Gap = Na+ − (Cl− + HCO3−). Normal range: 8–12 mEq/L.

Frequently Asked Questions

What is a normal anion gap?
A normal anion gap is typically 8–12 mEq/L. An elevated anion gap (>12) may indicate metabolic acidosis caused by conditions such as diabetic ketoacidosis, lactic acidosis, or toxic ingestions.
How is the anion gap calculated?
The anion gap is calculated as AG = Na+ − (Cl− + HCO3−). It represents the difference between measured cations and measured anions in the blood.

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