Active cancer (treated within 6 months or palliative)
Paralysis, paresis, or recent leg cast
Bedridden >3 days or major surgery within 12 weeks
Localized tenderness along deep veins
Entire leg swollen
Calf swelling >3cm vs. other leg
Pitting edema, symptomatic leg only
Collateral superficial veins (non-varicose)
Previously documented DVT
Alternative diagnosis at least as likely
Evidence
Original publication
Wells PS, Anderson DR, Rodger M, et al. Evaluation of D-dimer in the diagnosis of suspected deep-vein thrombosis. This is the modified 10-item Wells DVT model implemented here; it adds "previously documented DVT" (+1) to the original 9-item pretest-probability model (Wells PS et al., The Lancet 1997;350:1795–1798, PMID 9108350).
New England Journal of Medicine, 2003
Open source
Validation
Goodacre S, Sutton AJ, Sampson FC. Meta-analysis: the value of clinical assessment in the diagnosis of deep venous thrombosis. Pooled analysis showing the Wells score stratifies DVT prevalence across low/moderate/high categories.
Annals of Internal Medicine, 2005
Open source
Last reviewed: 2026-09
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MedScore is an educational and clinical decision-support tool. It does not provide a diagnosis, a treatment, or a drug-dosing recommendation, and it does not replace clinical judgement or local guidelines. Confirm every result against the original source before acting on it. The treating clinician remains responsible for all decisions.