David Liew talks to rheumatologist Nicola Cook about the utility of common investigations for suspected inflammatory arthritis in adults. They discuss the notion of pretest probability and how this is used to determine the utility of testing, and the role of specific tests. Nicola also talks about the potential harm of overinvestigation. Read the\xa0full article\xa0by Nicola and her co-author, Rachelle Buchbinder, in\xa0Australian Prescriber.