Mechanism of Non-Anion Gap Acidosis in Renal Tubular Acidosis

Laboratory Findings in RTA

• Normal anion gap (8-12 mEq/L) despite metabolic acidosis, as noted by Praxis Medical Insights 1
• Fractional excretion of chloride is usually elevated (>0.5%) in Bartter syndrome, which can present with similar electrolyte abnormalities, according to Kidney International 2
• Plasma chloride-to-sodium ratio may be altered depending on the specific type of RTA, as reported by Kidney International 2

Clinical Implications

• The non-anion gap acidosis in RTA is distinct from high anion gap acidosis seen in conditions like diabetic ketoacidosis or lactic acidosis, as summarized by Praxis Medical Insights 1