Wells' criteria for deep vein thrombosis
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When to use
Active cancer (treatment within the previous 6 months or current palliative care)
Yes
No
Bedridden recently ≥ 3 days or major surgery within the previous 12 weeks
Yes
No
Calf swelling > 3 cm compared to the asymptomatic side (measured 10 cm below tibial tuberosity)
Yes
No
Collateral superficial veins (non-varicose)
Yes
No
Entire leg swelling
Yes
No
Localized tenderness along the deep venous system
Yes
No
Pitting edema confined to symptomatic leg
Yes
No
Paralysis, paresis, or recent plaster immobilization of the lower extremity
Yes
No
Previously documented DVT
Yes
No
Alternative diagnosis at least as likely as DVT
Yes
No
Calculation
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