<unk>  <unk>  is the classical form of RTA, being the first described.<unk>  RTA is characterized by a failure of acid secretion by the alpha intercalated cells of the<unk>  tubule and cortical collecting duct of the<unk>  nephron. This failure of acid secretion may be due to a number of causes. It leads to relatively alkaline urine, due to the kidney's inability to acidify the urine to a pH of less than 5.3.
Distal renal tubular acidosis
Renal tubular acidosis
Proximal renal tubular acidosis
Isotonic hyponatremia
Hypotonic hyponatremia
Hyperchloremic acidosis
Cystinuria
Hyperosmolar syndrome