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Urine Anion Gap Calculator

UAG = U_Na + U_K − U_Cl.

Compute the urine anion gap from urine sodium, potassium, and chloride. A positive UAG in the setting of a hyperchloraemic metabolic acidosis suggests a renal cause (e.g. RTA); a negative UAG suggests gastrointestinal HCO₃⁻ losses.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

mEq/L
mEq/L
mEq/L

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

UAG = U_Na + U_K − U_Cl

In depth

Compute the urine anion gap from urine sodium, potassium, and chloride. A positive UAG in the setting of a hyperchloraemic metabolic acidosis suggests a renal cause (e.g. RTA); a negative UAG suggests gastrointestinal HCO₃⁻ losses.