Red,
You are right about the RAST test being the one they do with blood tests. I had that done many years ago before I had asthma and it is the very best allergy test, in my opinion. Having had allergies for many years, I had allergy testing done many times, but I would have never known about the food allergies with out the RAST test. It's more expensive, but worth it.
Take care!
Carla