How long it will take for the hydronephrosis to affect the renal function depends on the severity and urgency of the disease, which may take days or months.
In case of acute obstruction caused by ureteral stone or various surgeries, in the case of unilateral hydronephrosis, the opposite side can still carry out moderate compensation, and thus it will not cause serious damage to the renal function at that time, but due to the functional sensitivity of the kidneys and other reasons, if you can’t release the obstruction in time, it will cause irreversible damage to the renal function in a few months.
In case of prostatic hyperplasia or neurogenic bladder, causing bilateral hydronephrosis, the renal function may be affected in a few days, with elevated blood creatinine, urea nitrogen, metabolic acidosis, ionic disorders, nausea, vomiting, and so on.
All kinds of conditions lead to hydronephrosis should be timely and regular hospital consultation, identify the cause and follow the doctor’s instructions for treatment, so as not to delay the condition.