Before revision: A provocation study (also trial or test) is a form of clinical trial whereby participants are exposed to either a substance or "thing" that is claimed to provoke a response, or to a sham substance or device that should provoke no response.
After revision: A provocation test, also called a provocation trial or provocation study, is a form of clinical trial whereby participants are exposed to either a substance or "thing" that is claimed to provoke a response, or to a sham substance or device that should provoke no response.