Pulmonary Embolism Rule-Out Criteria In the United States, the workup rate for PE is astonishingly high, with 1-2% of all ED patients receiving a CTPA for PE and a low yield (~5-10% of CTPAs are positive for PE). Thus, major medical societies such as ACEP and the American College of Physicians recommend the use of risk stratification tools [1,2]. For some reason, approximately 25% of patients who are low risk AND PERC negative still receive d-dimer or imaging for PE, despite the risk of PE being exceptionally low. #Diagnosis #Pulmonary #Embolism #RuleOut #Criteria #PERC #HADCLOTS #Mnemonic
