All are features of renal tubular acidosis type I, except :

Aswer is D (Fanconi syndrome): Fanconis Syndrome is an entity characterized by defective tubular reabsorption of most amino acids, glucose. urate, phosphate and bicarbonate. Defective tubular absorption of bicarbonate, with failure to transpo hydrogen ions causes a renal tubular acidosis producing hyperchloremic acidosis. Proximal A (A type II) is most often due to generalized proximal tubular dysfunction manifested by glycosuria aminoaciduria and phosphaturia (Fanconi's Syndrome) - Harrisons