Urine cytology, including the FISH test, is "indicative" but not "diagnostic." That means that the results of the test should be taken into consideration, and if positive further tests really need to be done, but cannot diagnose the presence or absence of cancer by themselves. This is why the urologist did cystoscopy.
I had a combination of both papillary bladder cancer and CIS and have NEVER had positive urine cytology,
Sara Anne