Hematuria follow up

I am a 61 yr. old non-smoker. Last year I had a microscopic hematuria workup which included a cystoscopy, cytology and FISH test. Cytology and FISH test were negative. Cysto showed inflammation, but I had no UTI. The ruine specimen was actually negative for blood the day of the cysto, six weeks and 8 months later. Now, at my annual, it is again positive with a count of 23 RBC's. It was repeated a couple weeks later and still positive. I may not have been as concerned If the cysto was normal and I had had a normal IVP or renal sonogram (I had none done). What are the guidelines for testing now?  Should I be retested? Should I have the kidney tests done?