ToolsCalculators
Wells score for pulmonary embolism
Pre-test probability of pulmonary embolism.
Wells score for pulmonary embolism
Clinical signs of DVT
PE is the most likely diagnosis
Heart rate >100 /min
Immobilisation ≥3 days or surgery within 4 weeks
Previous PE or DVT
Haemoptysis
Malignancy (treated within 6 months or palliative)
Result0 points
PE unlikely — a negative D-dimer safely excludes PE.
- Two-tier
- PE unlikely
- Three-tier probability
- Low
When to use
- Patients with suspected pulmonary embolism, to select those in whom D-dimer can safely exclude PE versus those needing imaging.
Formula
Signs of DVT (3) + PE most likely diagnosis (3) + HR >100 (1.5) + Immobilisation/surgery (1.5) + Previous PE/DVT (1.5) + Haemoptysis (1) + Malignancy (1). Maximum 12.5 points.