# Wells Score for Deep Vein Thrombosis (DVT) Calculate the Wells score to estimate clinical probability of deep vein thrombosis (DVT). Components: active cancer (+1), paralysis/paresis/recent plaster immobilization (+1), recently bedridden ≥3 days or major surgery ≤12 weeks (+1), localized tenderness along deep veins (+1), entire leg swollen (+1), calf swelling ≥3 cm vs other leg (+1), pitting edema confined to symptomatic leg (+1), collateral superficial (nonvaricose) veins (+1), previously documented DVT (+1), alternative diagnosis at least as likely as DVT (−2). Reports BOTH interpretations: three-tier (low ≤0 ~5%, moderate 1–2 ~17%, high ≥3 ~17–53%) and dichotomized two-tier (DVT unlikely ≤1 — a negative D-dimer rules out; DVT likely ≥2 — ultrasound/D-dimer). Derived from Wells 1997 (Lancet) and the Goodacre 2005 (BMJ) meta-analysis. Not medical advice. > Canonical page: https://elysiatools.com/en/tools/wells-dvt-score - **Category:** Health - **Keywords:** Wells, deep vein thrombosis, DVT, venous thromboembolism, VTE, D-dimer, compression ultrasound, clinical prediction rule, leg swelling ## Overview Calculate the Wells score for suspected deep vein thrombosis (DVT) by selecting applicable clinical findings. The tool returns the total score with both three-tier and two-tier interpretations. It is a clinical prediction rule and not medical advice. ## Inputs - **Active cancer** (checkbox): Active cancer (treatment within 6 months or palliative). +1. - **Paralysis, paresis, or recent plaster immobilization** (checkbox): Paralysis, paresis, or recent plaster immobilization of the lower extremities. +1. - **Recently bedridden ≥ 3 days or major surgery ≤ 12 weeks** (checkbox): Recently bedridden ≥3 days or major surgery within 12 weeks. +1. - **Localized tenderness along deep veins** (checkbox): Localized tenderness along the distribution of the deep venous system. +1. - **Entire leg swollen** (checkbox): Entire leg swollen. +1. - **Calf swelling ≥ 3 cm vs other leg** (checkbox): Calf swelling ≥3 cm compared to the asymptomatic leg (measured 10 cm below the tibial tuberosity). +1. - **Pitting edema confined to symptomatic leg** (checkbox): Pitting edema confined to the symptomatic leg. +1. - **Collateral superficial veins (nonvaricose)** (checkbox): Collateral (nonvaricose) superficial veins. +1. - **Previously documented DVT** (checkbox): Previously objectively documented DVT. +1. - **Alternative diagnosis at least as likely as DVT** (checkbox): An alternative diagnosis at least as likely as DVT. −2. ## When to use - Estimate the clinical probability of DVT from documented symptoms and risk factors. - Review how individual findings contribute positive or negative points to the Wells score. - Compare the three-tier result with the two-tier interpretation for DVT likelihood. ## How it works - Select each applicable Wells criterion, including cancer, immobilization, recent surgery, swelling, tenderness, previous DVT, or an alternative diagnosis. - The tool adds 1 point for each positive criterion and subtracts 2 points when an alternative diagnosis is at least as likely as DVT. - It returns the total Wells score in JSON format. - The result reports three-tier risk categories and the two-tier classification of DVT unlikely or DVT likely. ## Use cases - Clinicians can document the contribution of each DVT finding during an initial assessment. - Medical students can study how the Wells criteria produce low, moderate, high, unlikely, or likely classifications. - Clinical teams can use the score as one structured input when considering subsequent evaluation such as D-dimer testing or ultrasound. ## Frequently asked questions ### What does the Wells DVT calculator measure? It estimates the clinical probability of deep vein thrombosis using the Wells clinical prediction rule. ### What findings add points to the score? Findings include active cancer, immobilization, recent surgery or bed rest, deep-vein tenderness, leg swelling, pitting edema, collateral veins, and previous DVT. ### Which finding subtracts points? An alternative diagnosis at least as likely as DVT subtracts 2 points. ### How are the scores interpreted? Three-tier results are low at 0 or below, moderate at 1–2, and high at 3 or more. Two-tier results are DVT unlikely at 1 or below and DVT likely at 2 or more. ### Does this calculator diagnose DVT? 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