Renal glycosuria is a rare condition in which glucose is excreted in the urine despite normal or low blood glucose levels. With normal kidney function, glucose is excreted in the urine only when there are abnormally elevated levels of glucose in the blood. However, in people with renal glycosuria, glucose is abnormally eliminated in the urine due to improper functioning of the renal tubules, which are the primary components of the filtering units of the kidneys. In most people with renal glycosuria, there are no apparent symptoms or serious effects. Rare cases of polyuria (increased urine output), enuresis (involuntary urination), and mild delays in growth and maturation during puberty have been reported. When renal glycosuria occurs as an isolated finding with otherwise normal kidney function, the condition is thought to be caused by mutations in the SLC5A2 gene. Treatment is not typically needed.

In most affected individuals, no treatment is required. However, some individuals with renal glycosuria may develop diabetes mellitus. Therefore, appropriate testing should be conducted to rule out diabetes and to regularly monitor those with confirmed renal glycosuria.