Wells score for PE clinical pretest probability
| . | Number of points . | Proportion of patients . | Prevalence of PE . |
|---|---|---|---|
| Variables | |||
| Clinically suspected DVT | 3 | ||
| Alternative diagnosis is less likely than PE | 3 | ||
| Heart rate >100 beats/min | 1.5 | ||
| Immobilization or surgery in previous 4-wk period | 1.5 | ||
| History of VTE | 1.5 | ||
| Hemoptysis | 1 | ||
| Malignancy or treatment of it in previous 6-mo period | 1 | ||
| Score interpretation | |||
| High probability* | ≥6.5 | 10% | 60% |
| Moderate probability* | 4.5-6.0 | 30% | 25% |
| Low probability† | ≤4.0 | 60% | 5% |
| . | Number of points . | Proportion of patients . | Prevalence of PE . |
|---|---|---|---|
| Variables | |||
| Clinically suspected DVT | 3 | ||
| Alternative diagnosis is less likely than PE | 3 | ||
| Heart rate >100 beats/min | 1.5 | ||
| Immobilization or surgery in previous 4-wk period | 1.5 | ||
| History of VTE | 1.5 | ||
| Hemoptysis | 1 | ||
| Malignancy or treatment of it in previous 6-mo period | 1 | ||
| Score interpretation | |||
| High probability* | ≥6.5 | 10% | 60% |
| Moderate probability* | 4.5-6.0 | 30% | 25% |
| Low probability† | ≤4.0 | 60% | 5% |
A score of ≥4.5 (moderate and high probability groups combined) has been termed “PE likely.” This group makes up ∼40% of patients and has a prevalence of PE of ∼33%.
Is also termed “PE unlikely.” In the original derivation of the Wells PE model, patients were required to have a score of ≤1.5 to be categorized as low probability, but a score of ≤4 has subsequently been used for low probability.8,9