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The PERC rule is based on a set of rule-out criteria for pulmonary embolism, to identify patients who are low risk of PE. If all criteria are not met then the risk of PE is
The PERC rule is not satisfied if any criteria is present, and imaging is indicated.
Carpenter CR, et al. Differentiating low-risk and no-risk PE patients: the PERC score. J Emerg Med. 2009; 36 (3); 317-22.Kline JA, et al. Clinical criteria to prevent unnecessary diagnostic testing in emergency department patients with suspected pulmonary embolism.J Thromb Haemost. Aug 2004; 2(8):1247-1255.