Nephrology Free

Serum Anion Gap

Calculates serum anion gap for metabolic acidosis workup.

Enter Values

Sodium (mEq/L)

Range: 100 - 180

Chloride (mEq/L)

Range: 70 - 130

Bicarbonate (mEq/L)

Range: 5 - 50

Score

Author Joseph J. Emmett and Robert G. Narins

First Published 1977

Evidence Standard clinical practice

Category Nephrology

Original Study Clinical use of the anion gap (Medicine, 1977)

About The anion gap (Na - Cl - HCO3) helps classify metabolic acidosis into high and normal anion gap types.

Clinical Use Workup of metabolic acidosis. Correct for albumin in hypoalbuminemia (add 2.5 mEq/L per 1 g/dL below 4).