If the Wells score for PE is 2-4, what is the next step?

If the Wells score for PE is 2-4, what is the next step?

• A. CT pulmonary angiography
• B. D-dimer testing
• C. Start anticoagulation
• D. PERC assessment

Answer: (D)

The main idea is using pretest probability to guide testing for PE. A Wells score of 2–4 places the patient in the PE unlikely category. In this low-risk setting, the next step is to apply the PERC rule to see if PE can be ruled out without testing. If none of the eight PERC criteria are present, you can safely rule out PE and avoid D-dimer or imaging. If any criterion is positive, you would then proceed with D-dimer testing (and, if positive, imaging like CT pulmonary angiography). Anticoagulation isn’t started here until PE is confirmed or a testing pathway confirms the diagnosis. So, the appropriate next step is to perform a PERC assessment.

The main idea is using pretest probability to guide testing for PE. A Wells score of 2–4 places the patient in the PE unlikely category. In this low-risk setting, the next step is to apply the PERC rule to see if PE can be ruled out without testing. If none of the eight PERC criteria are present, you can safely rule out PE and avoid D-dimer or imaging. If any criterion is positive, you would then proceed with D-dimer testing (and, if positive, imaging like CT pulmonary angiography). Anticoagulation isn’t started here until PE is confirmed or a testing pathway confirms the diagnosis. So, the appropriate next step is to perform a PERC assessment.