Wells Score (DVT & PE)

Active cancer (treatment ongoing, within 6 months, or palliative)+1Paralysis, paresis, or recent plaster immobilisation of the lower limb+1Recently bedridden ≥ 3 days, or major surgery within 12 weeks requiring general or regional anaesthesia+1Localised tenderness along the distribution of the deep venous system+1Entire leg swollen+1Calf swelling ≥ 3 cm larger than the asymptomatic side (measured 10 cm below tibial tuberosity)+1Pitting oedema confined to the symptomatic leg+1Collateral superficial veins (non-varicose)+1Previously documented DVT+1Alternative diagnosis at least as likely as DVT−2

0

DVT unlikely · Low probability

DVT likely at 2 or more; unlikely below 2.

Three-level: low ≤ 0, moderate 1–2, high ≥ 3.

Sources

DVT: Wells PS, Anderson DR, Bormanis J, et al. Lancet. 1997;350(9094):1795–1798, with the recurrent-DVT item from Wells PS, et al. N Engl J Med. 2003;349(13):1227–1235.
PE: Wells PS, Anderson DR, Rodger M, et al. Thromb Haemost. 2000;83(3):416–420.