urine anion gap


urine anion gap

Abbreviation: UAG
The sum of the concentrations of sodium and potassium in a specimen of urine, minus the urine chloride concentration. The UAG is used to assess the source of a metabolic acidosis. A positive value indicates the kidney is responsible for the acidosis. A large negative value indicates the kidneys are compensating for a metabolic acidosis caused by other organs. See also: gap