What is Allergy Testing? (Skin Prick Edition) With Allergist & Immunologist Dr. Prathyusha Savjani The test shown here is skin prick testing, a quick, in-office method where tiny amounts of allergens are introduced into the skin. It’s usually done on the back or forearm, and results show up within 15 minutes. This test is more sensitive and often more accurate than blood testing for many environmental and food allergies, but not always. That’s why results must be interpreted in the context of yo