Table 1.

Wells Prediction Rule for Diagnosing Deep Venous Thrombosis: Clinical Evaluation Table for Predicting Pretest Probability of Deep Vein Thrombosis

Clinical CharacteristicScore
Note: Clinical probability: low ≤ 0; intermediate 1–2; high ≥ 3. In patients with symptoms in both legs, the more symptomatic leg is used.
Reprinted from The Lancet, Vol 350, Wells PS, Anderson DR, Bormanis J, et al. Value of assessment of pretest probability of deep-vein thrombosis in clinical management, pp 1795–1798, Copyright 2002, with permission from Elsevier.
Active cancer (treatment ongoing, within previous 6 months, or palliative)1
Paralysis, paresis, or recent plaster immobilization of the lower extremities1
Recently bedridden >3 days or major surgery within 12 weeks requiring general or regional anesthesia1
Localized tenderness along the distribution of the deep venous system1
Entire leg swollen1
Calf swelling 3 cm larger than asymptomatic side (measured 10 cm below tibial tuberosity)1
Pitting edema confined to the symptomatic leg1
Collateral superficial veins (nonvaricose)1
Alternative diagnosis at least as likely as deep venous thrombosis−2