photopatch testing

photopatch testing

(fō′tō-păch″)
A test used to identify allergic reactions triggered by ultraviolet (UV) light (specifically, to UVA).

Patient care

Two equivalent samples of the putative allergen are prepared. Each is applied to one side of the upper back of the patient. One side is shielded from exposure to ultraviolet light, and the other is treated with UVA at standardized doses and intervals. The reactions of the skin on either side are compared.

Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Unavailability of these allergens, unavailability of photopatch testing, the small number of patients and not testing with patient's own cosmetics may have resulted in our missing some cases of cosmetic dermatitis.
The main investigative technique to diagnose photoallergic or phototoxic reactions is photopatch testing, although it is not commonly used (24,33-35).
Allergic and photoallergic contact dermatitis from ketoprofen: evaluation of cross- reactivities by a combination of photopatch testing and computerized conformational analysis.
Photoallergy, however, presents as eczematous dermatitis and subjective pruritus and should be confirmed with photopatch testing, Dr.