🫘 Urine Anion Gap Calculator
Calculate the urine anion gap to evaluate normal-anion-gap metabolic acidosis.
Urine Anion Gap Calculator
Urine sodium (mmol/L)
Urine potassium (mmol/L)
Urine chloride (mmol/L)
When to use
Distinguish renal tubular acidosis from extrarenal bicarbonate loss.
How it works
UAG = UNa + UK − UCl. Negative → appropriate NH₄⁺ excretion (GI loss); positive → impaired excretion (distal RTA).
Key points
- A surrogate for urinary ammonium.
- Unreliable with ketoacids or other unmeasured urinary anions.
- Interpret with serum acid–base and potassium.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.