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I TOPH. Use of the PERC 1 (Pulmonary Embolism Rule-out Criteria) rule III

can significantly decrease work-up for pulmonary embolism. To apply this rule, the clinician must first use clinical gestalt to classify the patient as low risk. The PERC rule, which consists of eight clinical criteria including history, physical and vital signs, can then be used. If both of these criteria are met, then there is less than a 2 percent risk that this patient has a PE and no further work-up is needed.

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PERC Rule Age < 50 years Pulse < 100 bpm Sa02 > 94% No unilateral leg swelling No hemoptysis No recent trauma or surgery No prior PE or DVT No hormone use

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