The allergists may say that prednisone won't affect testing, but here is what the drug overview says, "Prednisone is in a class of drugs called corticosteroids. Prednisone prevents the release of substances in the body that cause inflammation."
http://www.drugs.com/prednisone.html

And talking about the use of corticosteroids for chronic uticaria:

"Corticosteroids stabilize mast cell membranes and inhibit further histamine release, as well as reduce the inflammatory effect of histamine and other mediators. "
http://emedicine.medscape.com/article/137362-treatment#aw2aab6b6b2

If it prevents the release of substances (like histamine? Leukotrienes?) that cause inflammation, it seems very possible that it will alter test results as much, if not more than antihistamines. If it stabilizes mast cell membranes, it could also affect testing.

Of course you should go with what your physician says, but I always look into things as well. I've been told so many things that are clearly wrong by physicians, that I always do my homework, and make my decisions based on all the info I can find.

FYI... Hubby is going with me to South Carolina so I will not be driving myself.

This coming Monday is my appointment. And FYI I'm feeling some better. Tummy and bones are still a mess but im not vomitting anymore and my BP and heart rate aren't as wacky as a few days ago. The lump in my throat is really present. Five days down and just six more days of being off meds to go.
Got a call from pathology lab. My last GI biopsy retesting is done and ready for me to pick up report today. I'll let you know what it says but I have a feeling it will be nothing.
Later.
Kim