Wells Clinical Score for Deep Vein Thrombosis

Clinical Parameter Score	Score
Active cancer (treatment ongoing/within 6 mo)	+ 1
Paralysis or recent plaster immobilization of LE	+ 1
Recently bedridden >3 days or major sx <4 wks	+ 1
Localized tenderness along distribution of deep venous system	+ 1
Entire leg swelling	+ 1
Calf swelling 3 cm >asymptomatic leg	+ 1
Pitting edema (>asymptomatic leg)	+ 1
Previous DVT documented	+ 1
Collateral superficial veins (nonvaricose)	+ 1
Alternative diagnosis (as likely or > that of DVT)	– 2
Total Score
High probability	3
Moderate probability	1–2
Low probability	0
Additional Risks of DVT
AIDS Varicose veins Pacemakers Pregnancy Obesity Acute MI Long airline flights Recent central venous catheterization Blood type A Antithrombin deficiency Oral contraceptives

Source: Anand SS, Wells PS & Hunt D et al. (1998); Gulick D (2006).