Dear Sally,
I'm glad you pushed for the next appointment instead of waiting, please let us know how your cysto turns out. Urine tests are good for dx-ing high grade tumors but not low grade. Some of these newer tests say they're more accurate for low grade, like FISH, but they are not standard yet and considered expensive, NMP22 -though cheap- is not very accurate and still need to be used with cytology and cysto.
In any case a stage T1b tumor is a risky diagnosis that calls for VERY close follow up. Be your own best advocate, learn all you can. It's your life!
If you have any questions, just ask and I can try to point you to some answers. But cancer remains a kind of a crap shoot, no matter how you cut it, sorry to say.
All the best,
Wendy