Skin Prick Tests may occasionally show a positive reaction in persons who are actually sensitized to another cross-reactive allergen which shares the same chemical structure as the original allergen being tested. Thus the person may not truly be allergic to the original allergen.
Component Resolved Testing involves a blood test which measures IgE antibody levels to specific proteins in allergens that are highly associated with true allergy. Thus it helps to distinguish between true allergy and cross-reactivity to another substance that shares similar chemical properties.
The tests available in our institution include omega-5-gliadin (wheat) and Ara-H-2 (peanut)