Clinical decision rule to decrease unnecessary testing for patients with low risk of pulmonary embolism. To be applied, patient must be considered *low risk for PE.

If the patient has a low pre-test probability and all of the above are false ("PERC negative"), probability for pulmonary embolism is 1.4%

* Low risk is defined in the initial paper as "a board-certified emergency physician thought that a formal evaluation for pulmonary embolism was necessary." This can either be through clinical gestalt or by Well's Criteria.

Suggested algorithm for PE workup, by EM:RAP / Cameron Berg:

Kline JA, et al. Clinical Criteria to prevent unnecessary diagnostic testing in the emergency department patients with suspected pulmonary embolism. J Thromb Haemost 2004; 2:1247-55. Text

Orman, Rob and Berg, Cameron. Accelerated Diagnostic Pathway: PE. EM:RAP. May 2015. Link