Proximal Renal Tubular Acidosis in Vitamin D Deficiency Rickets

Summary An 8‐month‐old girl presented with classical vitamin D deficiency rickets, secondary hyper‐parathyroidism and hyperchloraemic acidosis. Renal acidification and bicarbonate titration studies showed the patient to have a proximal renal tubular acidosis. Rickets, secondary hy‐perparathyroidism and proximal tubular acidosis were corrected by administration of calcium and vitamin D. A causal relationship between hyperparathyroidism and renal proximal tubular acidosis is suggested.