You might talk to your vet. I had a dog allergy tested. Instead of doing it on the animal they were able to work with the blood. The vet sent the samples to A & M overnight instead of taking the dog there. It worked great for us. They even overnight the medications when we need refills.
The vet did mention doing something like that but he said it didn't have a high rate of success. I told him I would like to at least try it before I make a 4 hour drive to College Station.