Pulmonary Embolus – PERC Rule (PE)


Rule out PE


Clinic and Hospital


Age < 50 years «•»
Pulse < 100 beats min «•»
SaO2 >or= 95% «•»
No hemoptysis «Y» «N»
No oral hormone use «Y»«N»
No surgery/trauma «Y» «N»
No prior DVT or PE«Y» «N»
No unilateral leg swelling «Y» «N»


Pulmonary embolism can be ruled out clinically if none of the 8 PERC criteria are present in a patient with a low pretest probability of PE (e.g. Wells PE CPG score of


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