<prompt> Air-borne contact dermatitis can be diagnosed by-Skin biopsyPatch testPrick testEstimation of serum IgE levels  <response>: air borne contact dermatitis is diagnosed by patch testing with the specific allergen. eg: pahenium is the common allergen tested using patch test. IADVL TEXTBOOK OF DERMATOLOGY, INDIAN PATCH TEST SERIES PAGE 581. 