1. RELEVANCE. The quality of life of children with obstructive uropathy and the prognosis of obstructive uropathy are determined by the degree of involvement in the pathological process and the nature of kidney damage. In severe cases, obstructive uropathy is accompanied by a decrease and even loss of renal function with the subsequent formation of renal failure and disability of the child. In everyday clinical practice, the question constantly arises why, with the same type of uropathy, in some children, renal function after surgical treatment is rather quickly restored, while in others it continues to progressively decrease. This circumstance dictates the need to search for prognostic markers of the functional state of the kidneys and the progression of these diseases in children. 2. GOAL. In order to search for criteria for predicting the course and outcome of congenital obstructive uropathies to prevent the development of nephrosclerosis and chronic renal failure in children, we studied the results of surgical treatment of congenital OU depending on the initial morphological and functional state of the kidneys and ureters. 3. MATERIAL AND METHODS. For the convenience of mathematical analysis, the mean values of ultrasound and roentgenoplanimetry in children with II and III degree of obstruction in congenital OU were compared before the operation with the data of children examined up to 3 years old and after 3 years of follow-up examination. 4. RESULTS. After reconstructive plastic surgeries, during follow-up examination, a comparison of the ultrasound data, depending on the morphological picture of the LMS and MPS, showed: the average urinary rate of the URV in children with hypoplastic changes is significantly higher (p≤0.001) than in children who had sclerotic changes before surgery in the urodynamic nodes of the upper urinary tract (table 1). The duration of one urine ejection in children without sclerotic and decompensatory-atrophic changes in the ureteral wall differed less significantly (p≤0.05), but confidently (Table 1)