Soulbarn,
Welcome. Yes, as Sara Anne said the FISH test is notorious for false positives. However, with blood in the urine you certainly want to find out why. Often, blood in the urine has other causes than bladder cancer. I presume you have had a cystoscopy? The biopsy called a TURB (transuretheral resection) will give your URO some clarity with understanding it is the biopsy that is done as the key. You will not know anything until then. A CT Scan is often done to rule out other urinary tract problems.
Grade is simply low grade (slower growing) or high grade (faster growing.more dangerous tumors). Progression is how far a tumor has penetrated. Stage 0 (very early/superficial), 1 (first layers),2 (muscle invasive),3 ,4, (see this web site/menu drop downs for deeper explanations). Often a second opinion is good for fresh eyes and validation of a DX. 4weeks? I have no idea what is good now with COVID. While this is not elective in may be lower priority in hospitals. Boston may be a good start as you do want a practice or hospital that sees lots of bladder cancer.
