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PERC Calculator
Pulmonary Embolism Rule-out Criteria (PERC) assessment for emergency patients
Emergency Guidelines: The PERC rule is used in low-risk patients where suspicion of pulmonary embolism is low (< 15%). If all 8 criteria are negative (none present), PE can be safely ruled out. Answer each criterion below.
PERC Criteria Input
Assessment Results
⚠️ Not medical advice. For emergency medicine, pulmonology, and clinical reference only. PERC rule should only be applied to patients with a pre-test probability of PE < 15%. Clinical decision-making must be supervised strictly by an attending emergency physician.