Figure 2:

Flowchart shows the CDS process. Decision support statement 1: Measuring a d-dimer in patients with a low/intermediate clinical suspicion of pulmonary embolism is an appropriate first step in the workup of acute PE and will exclude the need for CTPA in some patients. Decision support statement 2: Based on current evidence as well as our experience at Brigham and Women’s Hospital, diagnosing an acute pulmonary embolism by CT pulmonary angiography in low- or intermediate-risk patients with a normal d-dimer is extremely unlikely. CTPA = CT pulmonary angiography.