PERC Rule Calculator
Apply the Pulmonary Embolism Rule-out Criteria (PERC) to determine if a low-risk patient can avoid further testing for PE.
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Formula
How it works: If a patient is "low risk" by clinical judgment and meets all 8 PERC criteria, the risk of PE is less than 2%, making further testing unnecessary.
Worked Example
Frequently Asked Questions
What is the utility of PERC?
It allows doctors to "rule out" pulmonary embolism in low-risk patients without even ordering a D-dimer blood test.
What if one criterion is positive?
The PERC rule cannot be used to rule out PE. The clinician must proceed to further testing, typically starting with a D-dimer.
Can I use it on high-risk patients?
No. The PERC rule is only valid for patients where the clinician's "gestalt" or suspicion of PE is already low (< 15%).
Is it possible to embed the PERC Rule Calculator on another website?
Yes, embedding the PERC Rule Calculator is free. Hit the "Embed" button on this page, adjust the width, height, and theme, then grab the iframe code. It works on WordPress, Wix, Squarespace, Shopify, and plain HTML pages. No registration needed. Full instructions at calculory.com/services/embed-calculators.
Medical Disclaimer
This calculator is provided for informational and educational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any decisions based on these results. Do not disregard or delay seeking medical advice because of information obtained from this tool.
AI Assistant
Ask about this calculator
I can help you understand the perc rule calculator formula, interpret your results, and answer follow-up questions.
Try asking
Our AI assistant provides general estimates and advice only. Please consult a qualified healthcare professional before making any health-related decisions.
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