[Diagnosis of chronic urticaria. Critical analysis of test results based on catamnestic studies].

305 patients suffering from chronic urticaria were tested according to a special program, which combined the common allergologic skin testing with the searching for foci of inflammation. The central part of the diagnosis, however, are oral provocation tests during potato/rice diet with non-steroidal antiphlogistic agents and so-called food additives as well as "natural" salicylates. Acetylsalicylic acid and indomethacin most frequently caused reactions of intolerance, whereas all of the patients tolerated paracetamol (500 mg) without any reactions.