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Most algorithms for management of suspected pulmonary embolism (PE) recommend d-dimer testing for patients with low pretest probability of disease (Wells score <2), with no further testing if d-dimer is negative and computed tomography (CT) scanning if d-dimer is positive. To determine the frequency of potentially avoidable imaging, researchers examined the charts of 3710 hemodynamically stable patients who presented to the emergency departments (EDs) of 12 U.S. hospitals (10 teaching and 2 community) and whose attending physicians ordered CT or ventilation/perfusion scans to evaluate for PE. In accordance with the National Quality Forum measure, imaging was considered potentially avoidable if it was performed on hemodynamically stable, low…