I believe that the test you are referring to, Urovysion, is also known as a FISH test. You could use the Search function at the top right of this page and search for FISH since there have been many posts from people who have had it.
The main problem with this test, as well as other urine cytology tests, is that they are very sensitive. This means that they often give positive results when there is no cancer present. Abnormal results can result from something such as a mild inflammation somewhere. These tests cannot diagnose cancer, but only indicate that there is something not quite normal. It may be harmless.and not cancer. It just indicates that you need to be checked and your urologist is doing that. Have you had a CT scan?
Difficult to deal with, I know.
Sara Anne