Anion Gap Calculator

Your details

Serum sodium. Normal is roughly 135-145 mEq/L. mEq/L and mmol/L are numerically identical here.
mEq/L
Serum chloride. Normal is roughly 98-107 mEq/L.
mEq/L
Serum bicarbonate (often reported as CO₂ on a metabolic panel). Normal is roughly 22-28 mEq/L.
mEq/L
Some labs add potassium to the gap. This raises the normal range by about 4 mEq/L.
Adjust the gap upward when serum albumin is low; each 1 g/dL below 4.0 hides about 2.5 mEq/L of gap.
Compares the rise in the gap to the fall in bicarbonate to detect a second, mixed acid-base disorder.
Anion gapNormal anion gap
12mEq/L
InterpretationNormal
12 mEq/L
Low<8Normal8-12High12+

Normal anion gap: 12 mEq/L.

  • Your anion gap is 12 mEq/L, computed as Na⁺ − (Cl⁻ + HCO₃⁻).
  • The normal range used here is 8-12 mEq/L; a value above that suggests a high-gap metabolic acidosis.
  • A normal or low gap does not rule out an acid-base disorder; it is one piece of the clinical picture.

Next stepInterpret alongside the blood gas, glucose, and clinical context; confirm any abnormal result with a clinician.

 = Powered by OnlyCalculators