Anion Gap Calculator for Dogs & Cats
Anion gap from sodium, potassium, chloride and bicarbonate.
Results are calculated in your browser. Always double-check before administering and use your clinical judgement.
How it is calculated
Anion gap = (Na⁺ + K⁺) − (Cl⁻ + HCO₃⁻) [1].
An increased anion gap is usually due to increased unmeasured anions and reflects metabolic acidosis — for example lactate, ketoacids, renal acids or exogenous agents such as ethylene glycol [1]. Compare with your laboratory's reference interval.
Worked example
(145 + 4) − (110 + 20) = 19 mEq/L.
Frequently asked questions
What does an increased anion gap mean?
An increased anion gap is usually due to increased unmeasured anions and reflects metabolic acidosis, for example lactate, ketoacids, renal acids or ethylene glycol [1].
More electrolytes & acid–base calculators
References
For veterinary professionals. Information supports — never replaces — clinical judgement; always check the current product label and local regulations.