PERC Rule for Pulmonary Embolism

Rules out PE if no criteria are present and pre-test probability is ≤15%

Age ≥ 50

HR ≥ 100

O2 Sat on Room Air < 95%

Prior History of DVT/PE

Recent Trauma or Surgery


Exogenous Estrogen

Unilateral Leg Swelling


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