Results of secondary oral provocation test (OPT) with culprit NSAID. Sixty-six OPTs were performed in 64 patients with a negative challenge for ASA. Nine patients had a positive secondary OPT. *Two patients had a history of multiple reactions after intake of several NSAIDs and underwent provocation tests with ibuprofen and diclofenac, both of which were negative. OPTs = oral provocation tests.