UVF is usually diagnosed by a CT urogram of the pelvis. If the ureter is not well visualized on the CT, then dye can be injected into the ureter through a telescope placed in the bladder. A UVF can also be suggested by the vaginal “pad test” used to diagnose a VVF – here the patient is given an oral medicine that stains the urine orange-red. If the vaginal gauze stains orange-red, then a UVF is typically also present