Wells Score for Deep Vein Thrombosis

Physicians are able to accurately stratify patients with suspected deep-vein thrombosis into three distinct pretest probabilities with the model.

Active cancer (treatment ongoing or within previous 6 months or palliative)
+1
Paralysis, paresis, or recent plaster immobilization of the lower extremities
+1
Recently bedridden longer than 3 days or major surgery within 4 weeks
+1
Localized tenderness along the distribution of the deep venous system
+1
Entire leg swollen
+1
Calf swelling by more than 3 cm when compared with asymptomatic leg (measured 10 cm below tibial tuberosity)
+1
Pitting edema (greater in the symptomatic leg)
+1
Collateral superficial veins (nonvaricose)
+1
Alternative diagnosis as likely or greater than that of deep-vein thrombosis
-2
Derivation Reference:

Wells, P.S., Anderson, D.R., Bormanis, J., Guy, F., Mitchell, M., Gray, C., Clement, C., Robinson, K.S., Lewandowski, B. Value of Assessment of Pretest Probability of Deep-Vein Thrombosis in Clinical Management. Lancet (London, England) 350, no. 9094 (December 20, 1997): 1795–98. doi:10.1016/S0140-6736(97)08140-3.

Validation Reference:

Wells, P.S., Anderson, D.R., Rodger, M., Forgie, M., Kearon, C., Dreyer, J., Kovacs, G., Mitchell, M., Lewandowski, B., Kovacs, M.J. Evaluation of D-Dimer in the Diagnosis of Suspected Deep-Vein Thrombosis. New England Journal of Medicine 349, no. 13 (September 25, 2003): 1227–35. doi:10.1056/NEJMoa023153.