II. Indications
- Assess DVT Pretest Probability
III. Criteria: Modified Wells Criteria
- Score -2: Other diagnosis at least as likely as DVT
- Score 1: Active malignancy within last six months (or palliative treatment)
- Score 1: Localized tenderness or pain over deep venous course
- Score 1: Entire leg swollen
- Score 1: Unilateral lower extremity Pitting Edema in the symptomatic leg
- Score 1: Non-varicose collateral superficial veins present
- Score 1: Previously documented DVT (added in the Modified Wells Score)
- Score 1: Lower extremity immobility
- Plaster Cast or similar
- Paralysis or paresis
- Score 1: Restricted mobility
- Bedridden for more than 3 days OR
- Major surgery in last 12 weeks
- Score 1: Calf circumference 3 cm over opposite calf
- Measure 10 cm below tibial tuberosity
IV. Interpretation
- Low Probability (3 to 5% DVT frequency): <=0 Points
- Medium Probability (17% DVT frequency): 1-2 Points
- High Probability (53 to 75% DVT frequency): >2 Points