Clinical feature	Score*
Active cancer within six months	1
Paralysis, paresis or cast of lower extremity	1
Recently bedridden for more than three days or major surgery within the past four weeks	1
Localized tenderness along distribution of deep venous system	1
Calf diameter more than 3 cm larger than opposite leg†	1
Pitting edema	1
Collateral superficial veins (nonvaricose)	1
Alternative diagnosis as likely or more likely than that of DVT	−2