The renal glucosuria - develops as a result of hereditary defect in ferment systems of renal canaliculuses. It is necessary to speak about a renal glucosuria when allocation of a glucose with urine exceeds a level of a physiological egestion (200 milligram in day). At a renal glucosuria the daily egestion of a glucose with urine usually makes 10-20 gram though cases of the glucosuria reaching 100 gram are known. Frequency of a renal glucosuria makes 2-3:1000; a mode of inheritance is autosomal -dominant.

Clinical picture. Clinical signs (except for a glucosuria) are observed mainly in very serious cases and caused by appreciable losses of Saccharum. Patients test delicacy, feeling of famine. The proof osmotic diuresis (polyuria) serves as the reason of development of a dehydration and a hypopotassemia. The delay of physical development of the child can be bound to deficiency of carbohydrates.