PERC Rule-Out Algorithm for Diagnosis of Pulmonary Embolism
 • Age ≥50
 • HR ≥100
 • O₂ sat on room air <95%
 • Unilateral leg swelling
 • Hemoptysis
 • Recent surgery or trauma
 • Surgery or trauma ≤4 weeks ago 
 • Prior PE or DVT
 • Hormone use

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