Wells score for DVT clinical pretest probability
| . | Number of points . | Proportion of patients . | Prevalence of PE . |
|---|---|---|---|
| Variables | |||
| Active cancer (treatment ongoing or within previous 6 mo or palliative) | 1 | ||
| Paralysis, paresis, or recent plaster immobilization of the lower extremities | 1 | ||
| Recently bedridden >3 d or major surgery within 4 wks | 1 | ||
| Localized tenderness along the distribution of the deep venous system | 1 | ||
| Entire leg swollen | 1 | ||
| Calf swelling 3 cm greater than on asymptomatic side (measured 10 cm below tibial tuberosity) | 1 | ||
| Pitting edema confined to the symptomatic leg | 1 | ||
| Dilated superficial veins (nonvaricose) | 1 | ||
| Previous documented DVT (or PE) | 1 | ||
| Alternative diagnosis as likely or greater than that of DVT | −2 | ||
| Score interpretation | |||
| High probability* | ≥3 | 10% | 60% |
| Moderate probability* | 1 or 2 | 30% | 25% |
| Low probability† | ≤0 | 60% | 5% |
| . | Number of points . | Proportion of patients . | Prevalence of PE . |
|---|---|---|---|
| Variables | |||
| Active cancer (treatment ongoing or within previous 6 mo or palliative) | 1 | ||
| Paralysis, paresis, or recent plaster immobilization of the lower extremities | 1 | ||
| Recently bedridden >3 d or major surgery within 4 wks | 1 | ||
| Localized tenderness along the distribution of the deep venous system | 1 | ||
| Entire leg swollen | 1 | ||
| Calf swelling 3 cm greater than on asymptomatic side (measured 10 cm below tibial tuberosity) | 1 | ||
| Pitting edema confined to the symptomatic leg | 1 | ||
| Dilated superficial veins (nonvaricose) | 1 | ||
| Previous documented DVT (or PE) | 1 | ||
| Alternative diagnosis as likely or greater than that of DVT | −2 | ||
| Score interpretation | |||
| High probability* | ≥3 | 10% | 60% |
| Moderate probability* | 1 or 2 | 30% | 25% |
| Low probability† | ≤0 | 60% | 5% |
A score of ≥2 has been termed “DVT likely.” This group makes up ∼40% of patients and has a prevalence of DVT of ∼33%.
A score of ≤1 has been termed “DVT unlikely.” This group makes up ∼75% of patients and has a prevalence of DVT of ∼10%. The original Wells DVT model was for a first suspected DVT and, therefore, did not include a score for previous VTE.