FIELD: medicine.
SUBSTANCE: nephrosonography is performed to determine a kidney volume (V pk, mm3). Child's height and age are specified and used to determine a reference kidney volume (V rk, mm3), to calculate a kidney volume coefficient (Kkv) by formula: 
, wherein Kkv is the kidney volume coefficient; V pk is the patient's kidney volume, mm3, and V rk is the reference kidney volume, mm3. In the unilateral ureteral obstruction, a healthy kidney volume coefficient (Khkv) and a obstruction kidney volume coefficient (Kokv) are calculated. If K hkv is more than 1.0, the absence of compensatory hypertrophy and hyperfunction is diagnosed; the morphofunctional kidney condition from the side of an obstructed ureter occurs to be noninvolved; the conservative treatment of the obstruction is preferred. If K hkv is more than 1.0 and less than 1.8, K okv is more than 1.0, compensatory hypertrophy and hyperfunction of the healthy kidney; the morphofunctional kidney condition from the side of the obstruction is depressed; a preserving surgery is chosen. Khkv between 1.8 or 2.0 and Kokv less than 1.0 enable diagnosing manifested compensatory hypertrophy and hyperfunction of the healthy kidney; kidney downsizing, functional depression are diagnosed from the side of the obstruction, and a nephrectomy is preferred.
EFFECT: method enables choosing the therapeutic approach to the ureteral obstruction in the children by detecting the clinical manifestations of the urinary outflow obstruction.
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