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Renal Tubular Acidosis

Pathophysiology
1. Kidney unable to excrete daily acid load
2. Results in Metabolic Acidosis
Types
Labs
1. Chemistry Panel
  1. Serum Chloride elevated
  2. Serum bicarbonate decreased
  3. Anion Gap normal
2. Arterial Blood Gas (ABG)
  1. Non-Anion Gap Metabolic Acidosis
3. Fractional Excretion of Bicarbonate
  1. FE-HCO3 <5%: Distal RTA
  2. FE-HCO3 >15%: Proximal RTA
    1. Assumes serum bicarbonate >20 meq/L

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This page was written by Scott Moses, MD. This page was last revised before 5/10/08, prior to consistent tracking of revision date. This page was last published on 6/1/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 6.0.