Wells DVT score = sum of selected criteria.

Criterion	Points
Active cancer treated within 6 months, or currently receiving palliative treatment	+1
Paralysis, paresis or recent plaster immobilisation of the lower limb	+1
Bedridden for ≥3 days, or major surgery within 12 weeks	+1
Localised tenderness along the deep venous system	+1
Entire leg swollen	+1
Calf swelling ≥3 cm compared with the asymptomatic leg, measured 10 cm below the tibial tuberosity	+1
Pitting oedema confined to the symptomatic leg	+1
Collateral superficial veins, non-varicose	+1
Previously documented DVT	+1
Alternative diagnosis at least as likely as DVT	-2

Three-tier model: ≤0 low probability. 1–2 moderate probability. ≥3 high probability.

Two-tier model: ≤1 DVT unlikely. ≥2 DVT likely.

Wells Criteria for Deep Vein Thrombosis (DVT)