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Application of the National Quality Forum pulmonary embolism (PE) imaging efficiency measure. Pretest probability is based on the Wells score: low pretest probability, less than 2 points; intermediate pretest probability, 2 to 6 points; high pretest probability, more than 6 points. All percentages were calculated using the number of hemodynamically stable (systolic blood pressure ≥90 mm Hg) patients who underwent workup for PE with imaging as the denominator.
