| Active cancer (treatment ongoing or within 6 months) | Yes No |
| Paralysis or recent immobilization of LE | Yes No |
| Recently bedridden for > 3 days or major surgery < 4 weeks | Yes No |
| Localized tenderness along the distribution of the deep venous system | Yes No |
| Entire leg swelling | Yes No |
| Calf swelling > 3 cm compared to the asymptomatic leg | Yes No |
| Pitting edema (> asymptomatic leg) | Yes No |
| Previous DVT documented | Yes No |
| Collateral superficial veins (nonvaricose) | Yes No |
| Alternative diagnosis (as likely or > that of DVT) | Yes No |
