<prompt> Defect in renal glucosuria-a GLUT 1b GLUT 2c SGLT 1d SGLT 2  <response>: Renal Glucosuria- Isolated glucosuria in the presence of a normal blood glucose concentration is due to mutations in SLC5A2, the gene that encodes the high-capacity sodium - glucose co-transpoer SGLT2 in the proximal renal tubule. 