When I talked to the lady at Dr. Dramov's office (I have a phone apt. set up for my son) she said that he typically just does the IgG testing anyways. That's what I had done for my three kids, though for myself I had the blood serum test done. I came back IgG reactive to all dairy in varying degrees, from moderate to very high, but had no IgE response to anything. Our insurance was paying for it, so I figured for myself I might as well go ahead and have both done. It sure was nice for my young kids though to just have the finger prick, as that seems a lot less traumatic to a child than the needle in the arm, though in reality the little bit of pain from it is about the same for either one. The IgG reactions are typically going to be the ones that are harder to pinpoint on their own, simply b/c of the possibility of the reaction being delayed up to 3 days (from my understanding). For us, the IgG told me that my oldest dd, 5, has a very high reaction to eggs, though I never would have guessed/known it, and high to very high for spelt, wheat, gluten, etc. I expected her to be allergic to dairy, but in fact she wasn't, except very low for whey, and neither were my other two, though that is really the only main one for myself! Anyways, there were some other random things that I know now to make sure we don't overdo it on those things, so all around it was very helpful to have the IgG results. I would like to get them retested at the end of the year, and have thought about going ahead and doing the blood serum test just to make sure there's no IgE reaction to anything. When I initially had this testing done, I thought that I was going to be able to have both results from the finger stick, but USBiotek had already made the change. If you can do both, I say go ahead and do it, that way you know that you have everything covered and can make sure you have all allergens removed from your diet during the time that you're working on repairing damage done to the gut.