Urine Anion Gap

Urine Na⁺

mmol/L

Urine K⁺

mmol/L

Urine Cl^-

mmol/L

UAG:

mmol/L

UAG = Na⁺ + K⁺ - Cl^-

Urine Anion Gap: UAG

The ammonia index in urine. Helps to determine the cause of bicarbonate loss during (serum) AG normal metabolic acidosis.

UAG<0: Loss through the gastrointestinal tract

UAG>0: Renal loss (distal renal tubular or Type IV renal tubular acidosis)