Wells Rule and the Primary Care Rule Scoring to Rule Out Deep Vein Thrombosis (DVT)
| Variables | Wells Rule | Primary Care Rule |
|---|---|---|
| Male sex | – | 1 |
| Oral contraceptive use | – | 1 |
| Presence of active malignancy (within last 6 mo) | 1 | 1 |
| Immobilization paresis/plaster lower extremities | 1 | – |
| Major surgery (last 3 mo) | 1 | 1 |
| Absence of leg trauma | – | 1 |
| Localized tenderness of deep venous system | 1 | – |
| Dilated collateral veins (not varicose) | 1 | 1 |
| Swelling, whole leg | 1 | – |
| Calf swelling ≥3 cm | 1 | 2 |
| Pitting edema confined to the symptomatic leg | 1 | – |
| Previously documented DVT | 1 | – |
| Alternative diagnosis at least as likely as DVT | −2 | – |
| Positive D-dimer result | – | 6 |
| Cutoff scores for considering DVT as absent | ≤1 | ≤3 |