The options to diagnosing vesicoureteral reflux (VUR) would either be a VCUG or radionuclide cystogram (RNC). All children under the age of seven with a first UTI should, after treatment of the acute infection, undergo a VCUG or RNC to detect the presence and severity of VUR. Classification of reflux and evaluation of lower tract anatomy are difficult with RNC - thus if there is a positive RNC, a VCUG needs to be performed.
Ultrasonography is also performed to see if any other anatomic abnormalities are present.
Based on these recommendations, it would seem that the VCUG would be the most comprehensive test. Although there are other causes of the infection, the one that needs to be evaluated for is VUR and thus, I would suggest discussing this recommendation with your personal urologist.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Thanks,
Kevin, M.D.