The Wells Score stratifies pre-test probability for DVT and PE to guide imaging decisions. Use with clinical judgment and D-dimer testing per your institution's protocol.
Wells DVT Score Criteria
Wells PE Score Criteria
How to Use the Wells Score Calculator
The Wells score calculator provides two validated clinical prediction rules: the Wells DVT criteria for lower extremity thrombosis and the Wells PE criteria for pulmonary embolism.
DVT Score Interpretation
Score 0 or less = Low probability (3% DVT prevalence). Score 1–2 = Moderate probability (17%). Score 3 or more = High probability (75%). Low probability with a negative D-dimer safely excludes DVT in most patients. Moderate and high scores require compression ultrasound.
PE Score Interpretation
Score 0–1 = Very low probability. Score 2–4 = Low probability. Score 5–6 = Moderate. Score 7+ = High probability. The simplified Wells PE score uses a cutoff of ≤4 (PE unlikely) vs >4 (PE likely). Combined with D-dimer, this algorithm reduces unnecessary CT-PA while maintaining safety.
FAQ
Is this Wells score calculator free?
Yes, completely free with no signup required.
What is the Wells DVT Score?
The Wells DVT Score uses 8 clinical criteria to estimate the pre-test probability of deep vein thrombosis: active cancer, paralysis or plaster cast, bed rest/major surgery, localized tenderness, entire leg swelling, calf swelling >3cm, pitting edema, collateral veins, and prior DVT. A score ≥2 indicates high probability.
What is the Wells PE Score?
The Wells PE Score uses 9 criteria to estimate pulmonary embolism probability, including DVT signs and symptoms, alternative diagnosis less likely, heart rate >100, immobilization or surgery, prior DVT or PE, hemoptysis, and active malignancy. Scores guide imaging decisions.
How are the Wells scores used clinically?
Low probability Wells scores combined with a negative D-dimer can effectively rule out DVT or PE without imaging. Moderate-to-high probability requires compression ultrasound (DVT) or CT pulmonary angiography (PE). The scores reduce unnecessary imaging while maintaining diagnostic sensitivity.
Can I self-diagnose DVT or PE using this tool?
No. This is a clinical decision support tool intended for use by healthcare professionals. DVT and PE are potentially life-threatening conditions requiring professional evaluation, laboratory testing, and imaging. If you have symptoms of DVT (leg swelling, pain, warmth) or PE (shortness of breath, chest pain, rapid heart rate), seek emergency medical care immediately.