Figure 2:

Flowchart of CDS process. Decision support message 1: “Based on the information you have provided, CT may not be appropriate for your patient. Published guidelines suggest that a ‘PE unlikely’ patient should have a d-dimer measured to further guide decision making.” Decision support message 2: “Based on the information you have provided, CT may not be appropriate for your patient. Published guidelines suggest that a ‘PE unlikely’ patient with a normal d-dimer is unlikely to have a pulmonary embolism.” CTPA = CT pulmonary angiography.