II. Indications

  1. Non-Anion Gap Metabolic Acidosis
  2. Distinguishes renal from extra-renal causes

III. Physiology: Measures unmeasured anions present in urine

  1. Sulfates
  2. Phosphates
  3. Bicarbonates
  4. Organic anions
    1. Lactate
    2. Citrate

IV. Calculation

V. Interpretation: Normal

  1. UAG = -10 to +10

VI. Interpretation

  1. Decreased Urine Anion Gap <-10
    1. Extrarenal Non-Anion Gap Metabolic Acidosis
  2. Increased Urine Anion Gap >+10
    1. Renal Non-Anion Gap Metabolic Acidosis

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