A Answers (2)
Mehmet Oz, MD, Cardiology, answeredA "skin-prick test" can be the answer to one who has an unknown allergy. Watch as Dr. Oz and Dr. Bassett test an audience member for allergies.
Jacob Teitelbaum, Integrative Medicine, answered
For sneezing/runny nose type inhalation allergies, standard skin testing works well (i.e., putting a drop of the stuff you're allergic to on the skin and making a tiny prick with a needle to see if the area turns red). For food allergies, skin testing and most blood tests are not reliable. The blood tests seem to almost randomly pick 30-40 foods and say you're allergic to them. Repeat the test another day and it may pick totally different foods that it says you're allergic to. Avoid these tests - they are a good way to make yourself nuts.
If you do not know what is causing your symptoms, an elimination diet for food and chemical allergies is a good idea. In this, you avoid common allergy producing foods and chemicals for 7-10 days and then retry them one at a time.