I've been having hell with my sinuses all winter and it was recently suggested by my new ENT that I be allergy tested. Since I'm on prednisone, all that could be done is the RAST test which should be good enough. I went to see my RD today and while I was there I got a copy of a RAST that I had done there in 2003. Back then it said I had a level 3 allergy to dust mites, kentucky bluegrass and some other things. Can these things change or will they most likely be the same with the latest test? I wasn't allergic to dog or cat dander then and hope it hasn't changed now.