Wells' Criteria for DVT

Clinical pretest probability score for suspected lower-extremity deep-vein thrombosis

INSTRUCTIONS

(1) Calf Measurement: Measure the circumference of both calves exactly 10 cm below the tibial tuberosity. A difference of > 3 cm is significant (+1 point). (2) Active Cancer Definition: Only score +1 for active cancer if the patient has received treatment for it within the last 6 months, or if the cancer is explicitly receiving palliative care. (3) Alternative Diagnosis: You must objectively assess if another diagnosis (e.g., cellulitis, Baker's cyst rupture, superficial thrombophlebitis, muscle tear) is equally or more likely than a DVT. If yes, you must subtract 2 points.

Active cancer*

Bedridden recently >3 days or major surgery within 12 weeks*

Calf swelling >3 cm compared to the other leg*

Collateral (nonvaricose) superficial veins present*

Entire leg swollen*

Localized tenderness along the deep venous system*

Pitting edema, confined to symptomatic leg*

Paralysis, paresis, or recent plaster immobilization of the lower extremity*

Previously documented DVT*

Alternative diagnosis to DVT as likely or more likely*