Rae, I am one of the 20% who have GPA who have never had a positive result on an ANCA test. Or at least it is so minimal that it’s not considered positive. I don’t know the explanation, but it’s something to keep in mind. The other tests, though, should be showing something, though I think some of them can take some time to show up. I hope this means you don’t have GPA. If the ENT thinks there’s a place in your nose that would suggest a sample for a biopsy, he could do that. Mine did it right in his exam chair with a topical anesthetic, and it wasn’t bad. That’s how I got my dx, although they can give false negatives. Maybe you just have a deviated septum, which could explain the dip on one side. Those run in my family. Good luck!