Venous Thromboembolism: Classification, Risk Factors, Diagnosis, and Management
Table 1
Clinical characteristics for predicting the pretest probability of deep venous thrombosis. The Wells score model demonstrates well-established criteria for assessment of suspected DVT [22, 23].
Wells score
Clinical characteristics
Score
Active cancer
+1
Paralysis or plaster immobilisation
+1
Bed rest >3 days or major surgery <4 weeks
+1
Localised tenderness along the distribution of the deep venous system
+1
Entire leg swollen
+1
Calf swelling >3 cm when compared with asymptomatic leg
+1
Pitting oedema
+1
Collateral superficial veins (nonvaricose)
+1
Previously documented deep vein thrombosis
+1
Alternative diagnosis at least as likely as deep vein thrombosis