There are many tests that can be done .. is it a matter of becoming erect or do you become erect then not able to hold an erection? If so that is called venous leakage meaning the blood goes in to make an erection but leaks back out. There is little or nothing that can be done to the blood vessels most times it does not help. I went through all the tests ..tried the penile shots which did not work and last June ended up doing an implant.