reccurrent UTI can be medically controlled by first treating the active infection.
look for post void reside in ultrasound
this will need treatment
a uroflowmetry or cystometrography will help in diagnosing bladder function
single functioning kidney
also should be monitored with serum creatinine
every 2 months.
of bad kidney is needed only if it is the sorce of infection with some abcess, stone, hemorrage or obstruction. all this assessment has to be done by your doctor with help of adequate investigations