Wells Score for PE — Free Online Calculator
Criteria
Wells Score
0
Low probability (~1.3% PE incidence)
About This Calculator
The Wells Score for Pulmonary Embolism (PE) is a clinical prediction rule used to estimate the pre-test probability of PE. It helps clinicians decide whether further diagnostic testing (such as D-dimer or CT pulmonary angiography) is warranted. The score is based on clinical signs, symptoms, and risk factors.
Formula
Interpretation
| Score | Risk Level | PE Incidence |
|---|---|---|
| < 2 | Low | ~1.3% |
| 2 – 6 | Moderate | ~16.2% |
| > 6 | High | ~37.5% |
References
Frequently Asked Questions
What are the Wells criteria for pulmonary embolism?
The Wells score includes: clinical signs of DVT (+3), PE is the most likely diagnosis (+3), heart rate >100 (+1.5), immobilization or surgery within 4 weeks (+1.5), previous DVT/PE (+1.5), hemoptysis (+1), and active cancer (+1). Total score stratifies PE probability.
How do you interpret the Wells score for PE?
Using the two-tier model: score ≤4 indicates PE unlikely (prevalence ~8%), and >4 indicates PE likely (prevalence ~34%). For the three-tier model: 0–1 is low risk, 2–6 is moderate risk, and ≥7 is high risk. D-dimer testing is appropriate when PE is unlikely.
Can you rule out PE with a negative D-dimer and low Wells score?
Yes. In patients with a Wells score ≤4 (PE unlikely) and a negative high-sensitivity D-dimer, PE can be safely ruled out without CT pulmonary angiography. This approach has a negative predictive value >99%.
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⚠ Medical Disclaimer
This tool is for educational and informational purposes only. It is not intended to replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional for clinical decisions.