How does the Anion Gap Calculator work?

Calculate: AG = [Na⁺] - ([Cl⁻] + [HCO3⁻]) Then: Normal is 8-16 mEq/L (or 6-12 using newer methods) Then: High AG suggests organic acid accumulation (lactate, ketones).

Can you give an example of how to use the Anion Gap Calculator?

Example: Input Na 138, Cl 104, HCO3 14 gives a result of AG = 20 (elevated, high AG metabolic acidosis) (Suggests lactate or ketosis).

Is the Anion Gap Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Anion Gap Calculator?

Our Anion Gap Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Anion Gap Calculator

Anion Gap

Sodium (mEq/L)

Chloride (mEq/L)

HCO₃ (mEq/L)

Anion gap measures unmeasured anions in blood, helping identify metabolic acidosis causes. It's calculated from electrolyte values.

Difficulty:intermediate

References

›Anion Gap Calc — Wikipedia

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Anion Gap