| Clinical feature | Score |
|---|---|
| Tenderness along entire deep vein system | 1.0 |
| Swelling of the entire leg | 1.0 |
| Greater than 3 cm difference in calf circumference | 1.0 |
| Pitting oedema | 1.0 |
| Collateral superficial veins | 1.0 |
| Risk factors present: | |
| Active cancer | 1.0 |
| Prolonged immobility or paralysis | 1.0 |
| Recent surgery or major medical illness | 1.0 |
| Alternative diagnosis likely (ruptured Baker's cyst in rheumatoid arthritis, superficial thrombophlebitis, or infective cellulitis) | −2.0 |
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