Table 1. Wells Clinical Prediction Rule for DVTa Clinical feature
PointsActive cancer (treatment within 6 months, or palliation) Paralysis, paresis, or immobilization of lower extremity
Bedridden for more than 3 days because of surgery (within 4 weeks) Localized tenderness along distribution of deep veins Entire leg swollen
Unilateral calf swelling of greater than 3 cm (below tibial tuberosity) Unilateral pitting edema Collateral superficial veins
Alternative diagnosis as likely as or more likely than DVT Total points
Risk score interpretation (probability of DVT): • ≥ 3 points: high risk (75%); • 1 to 2 points: moderate risk (17%); • < 1 point: low risk (3%).
Points 1 1 1 1 1 1 1 1
-2
a Wells PS et al. Lancet. 1997;350(9094):1795-8
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