Wells Score Calculator (Pulmonary Embolism)
Estimate the pre-test probability of pulmonary embolism with the Wells score. Example: a heart rate above 100 and recent immobilization score 3.0, a moderate-probability (three-tier) and PE-unlikely (two-tier) result.
Show steps
How to use the Wells Score Calculator (Pulmonary Embolism)
- Enter the values in the fields.
- Press Calculate to see the result with the steps shown.
Formula and method
Wells (PE) = clinical signs of DVT (3) + PE most likely (3) + HR over 100 (1.5) + immobilization or surgery (1.5) + previous DVT/PE (1.5) + hemoptysis (1) + malignancy (1).
Wells PE score criteria
| Criterion | Points |
|---|---|
| Clinical signs of DVT | 3.0 |
| PE is the most likely diagnosis | 3.0 |
| Heart rate above 100 | 1.5 |
| Immobilization or recent surgery | 1.5 |
| Previous DVT or PE | 1.5 |
| Hemoptysis | 1.0 |
| Malignancy | 1.0 |
Interpreting the score
| Model | Score | Meaning |
|---|---|---|
| Three-tier | Below 2 | Low probability |
| Three-tier | 2 to 6 | Moderate probability |
| Three-tier | Above 6 | High probability |
| Two-tier | 4 or below | PE unlikely |
| Two-tier | Above 4 | PE likely |
Role of D-dimer
In low or PE-unlikely patients, a negative D-dimer rules out PE in most cases. A positive D-dimer, or a higher score, leads to imaging.
Cautions
This calculator is for education and is not medical advice. Decisions about diagnosis and treatment belong with a qualified clinician.
Frequently asked questions
What is the Wells score for PE?
A rule that estimates the probability of pulmonary embolism.
What score is high risk?
Above 6 on the three-tier model.
Is there a Wells score for DVT?
Yes, a separate score.
What is PE unlikely?
A score of 4 or below.
Does a low score rule out PE?
Not alone; a D-dimer is usually added.
Is PE an emergency?
Yes; seek care right away for symptoms.
Sources
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