The Wells Score for Pulmonary Embolism (PE) is a validated clinical decision rule used to estimate the pre-test probability of PE. This calculator helps clinicians rapidly stratify patients into low, moderate, or high-risk categories based on key clinical findings and medical history, guiding further diagnostic testing and patient management.
Formula:
The Wells Score for Pulmonary Embolism is calculated by summing points for specific clinical criteria:
- Clinical symptoms of DVT (leg swelling, pain with palpation): +3.0 points
- Other diagnosis less likely than PE: +3.0 points
- Heart rate > 100 bpm: +1.5 points
- Immobilization (≥ 3 days) or surgery (within 4 weeks): +1.5 points
- Previous DVT/PE: +1.5 points
- Hemoptysis: +1.0 point
- Malignancy (on treatment, treated within 6 months, or palliative): +1.0 point
Interpretation (Traditional Dichotomous):
- PE Likely: > 4.0 points
- PE Unlikely: ≤ 4.0 points
Interpretation (Revised Three-tier):
- High Probability: ≥ 6.0 points
- Moderate Probability: 2.0 to < 6.0 points
- Low Probability: < 2.0 points