| Active cancer (treatment ongoing, within 6 months, or palliative) | Yes No |
| Paralysis, paresis, or recent immobilization of lower extremity | Yes No |
| Recently bedridden for > 3 d or major surgery within 4wk | Yes No |
| Tenderness along distribution of deep venous system | Yes No |
| Entire leg swollen | Yes No |
| Calf swelling with circumference disparity > 3cm (measured 10cm distal to tibial tuberosity) | Yes No |
| Pitting edema, greater in symptomatic leg | Yes No |
| Collateral superficial veins visible (non-varicose) | Yes No |
| Alternative diagnosis as likely as or greater than that of DVT | Yes No |
