Pulmonary Embolism Rule-Out Criteria (PERC)Loading...Age > 50No0Yes+1Heart rate >100No0Yes+1O2 sat < 94%No0Yes+1Unil leg edemaNo0Yes+1HemoptysisNo0Yes+1Recent surgeryNo0Yes+1History of VTENo0Yes+1Estrogen useNo0Yes+1