Urinary Anion Gap Calculator

Calculate urinary anion gap from urine sodium, urine potassium, and urine chloride.

878.5K uses Updated · 2026-05-25 Runs locally · zero upload
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How to Use Urinary Anion Gap Calculator

  1. Enter urine sodium concentration in mmol/L.
  2. Enter urine potassium concentration in mmol/L.
  3. Enter urine chloride concentration in mmol/L and review whether the calculated UAG is negative or positive.

Formula & Theory - Urinary Anion Gap Calculator

Urinary Anion Gap Calculator uses this core formula:

UAG = Urine sodium + Urine potassium - Urine chloride

Urinary anion gap is used as a rough surrogate for urinary ammonium excretion in metabolic acidosis evaluation. Chloride often rises when ammonium chloride excretion is high, producing a negative UAG. A positive UAG can suggest impaired renal acid excretion, though the interpretation is imperfect. Ketoacids, hippurate, unusual anions, kidney function, and urine collection conditions can all distort the relationship.

Use Cases for Urinary Anion Gap Calculator

  • Distinguishing extra-renal bicarbonate loss from renal tubular acidification problems.
  • Teaching why urine chloride matters in metabolic acidosis.
  • Reviewing acid-base cases where urine electrolytes are already measured.

Frequently asked questions about Urinary Anion Gap Calculator

Does Urinary Anion Gap Calculator store my inputs?

No. The calculation runs in your browser and is not sent to a server.

Can Urinary Anion Gap Calculator replace professional judgment?

No. It is a formula-based reference tool and should be interpreted with professional context.