The specific IgE (or sIgE) test and the enzyme-linked immunosorbent assay (ELISA) test detect specific antibodies to allergens and are most commonly used to diagnose allergies. In both, a small amount of blood is taken and analyzed for IgE antibodies (allergic antibodies) to specific antigens.
Got allergies that don't seem to get better, no matter what you do? Check these four common reasons why allergies don't improve -- and what to do about it. Tightening up in these four areas may go a long way toward reducing allergy symptoms of all kinds.