The director of the internal medicine department has to decide whether to recommend that St. Swithin's Hospital acquire equipment to aid in the diagnosis of Deep Vein Thrombosis (DVT). St. Swithin's already has Doppler testing and Venography available to try to diagnose DVT, but these tests are not 100% accurate. New data on the performance of the equipment suggests that this may be a useful alternative. Treating patients on the basis of clinical evidence only, that is, without using any diagnostic test, is also an option but the treatment, and some of the tests, place patients at a risk.
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