Hematology

PERC Rule

Pulmonary Embolism Rule-out Criteria for low-risk patients

Input Parameters

Age ≥50 years*

Heart rate ≥100 bpm*

O₂ saturation <95% on room air*

Hemoptysis*

Estrogen use*

Surgery or trauma requiring hospitalization within 4 weeks*

Previous PE or DVT*

Unilateral leg swelling*

Clinical Note (Optional)

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