There are three blood tests and a culture that can show asper. Unfortunately, all of them can be negative in a bird that has asper. That's been the case for Judy and we absolutely know that she has asper because the vet has seen the hyphae in material that came out of her nose and later cultures where it grew. Amphotericin B can be really hard on the body. With Judy we've had great success nebulizing it. The worst part about asper is that it's very hard on the body and allows opportunistic bacteria to grow. Judy currently has pseudomonas and staff in addition to the asper. Hopefully a culture and sensitivity will tell you exactly what you're dealing with.
It's not fun to be part of the sick bird club, but at least you're not alone.