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For this test, a small amount of blood is drawn and tested. Later, a lab technician will add trace amount of allergens with some of the patient's drawn blood. Under a microscope, the amount of allergy antibody or IgE is produced by the blood is measured and used to determine how allergic you are to the allergen. Usually this method is better in cases of severe reactions, because only a small sample of blood is reacting to the allergens instead of your whole body.