Hi Sherry....UC will come back with a positive ANCA as well...
I found this site to confuse you further....as you see it's a complicated process. You have lots going on...maybe the rheumie will be able to narrow it all down to one thing.
http://www.thedoctorsdoctor.com/Diseases/anca.htm
Try not to overreact at this point...as strange as this sounds, you should show positive considering all that's going on.
Hang tough! I hope you don't have to wait too long for your appointment...the waiting and guessing is the worst!
H xx