Table 2.

Well score (clinical decision rule for DVT).

Clinical Variable	Points
Active Cancer	+1
Paralysis, Paresis, or Plaster Immobilization of Lower Extremities	+1
Bedridden for 3+ days, or major surgery in past 12 weeks involving general or regional anesthesia	+1
Deep Venous System Localized Tenderness	+1
Swelling of Entire Leg	+1
Calf Swelling ≥3 cm larger on other leg	+1
Pitting Edema only on symptomatic leg	+1
Collateral Superficial (Non-varicose) Veins	+1
Previously Documented DVT	+1
Alternative Diagnosis at least as likely as DVT	−2
Three-point Wells Score
Low	<1
Intermediate	1–2
High	>2
Two-point Wells Score
Unlikely	≤1
Likely	≥2