The gold standard of allergy testing is to do a skin test for environmental allergies. I chose to save "a little" money and do the blood test. I should've spent the little extra. I also did food allergy testing but that was a total waste of money. The blood test did not show that chicken was an allergen even though that was proven ear infection after ear infection after consuming anything with chicken in it. Instead the tests showed she was allergic to the proteins she was currently eating which wasn't true at all. You are better off doing a novel diet and slowly introducing diff ingredients to see if there is a reaction just like you would do with children. It's painstaking but it's truly the best method for figuring out food allergies.