Renal glycosuria is also referred to as renal glucosuria. It is a rare genetic syndrome characterized by the excretion of simple sugar glucose in the urine despite low or normal blood glucose levels. When the kidneys function normally, glucose is eliminated in the urine only when glucose in the blood is abnormally high. However, in patients with renal glycosuria, glucose is abnormally excreted in the urine as a consequence of a malfunction in the renal tubules.

In most cases, renal glycosuria is asymptomatic and has no serious effects.

Renal glycosuria results from the improper functioning of the renal tubules, which are which are the primary components of nephrons, the filtering units of the kidneys. Renal glycosuria is believed to be a congenital defect with an autosomal recessive pattern of inheritance.