High Anion Gap Acidosis is seen in all of the following conditions, EXCEPT:: (A) Diabetic Ketoacidosis, (B) Lactic Acidosis, (C) Renal Tubular Acidosis, (D) Methanol Poisoning
Answer is C. Proximal and distal renal tubular acidosis is associated with non anion gap metabolic acidosis. In this, the reciprocal changes in chloride and bicarbonate result in a normal anion gap. Must know: Causes of high anion gap acidosis are: Lactic acidosis Ketoacidosis: Diabetic, alcoholic, starvation Toxins: Ethylene glycol, methanol, salicylates, propylene glycol and pyroglutamic acid Acute and chronic renal failure Ref: Harrison's Principles of Internal Medicine, 18th edn, chapter 47