Wells Score for DVT Calculator

Estimate the pre-test probability of deep vein thrombosis (DVT) using the Wells clinical prediction rule.

Active cancer (treatment ongoing, within 6 months, or palliative)

Paralysis, paresis, or recent plaster immobilisation of lower extremities

Recently bedridden >3 days or major surgery within 12 weeks

Localised tenderness along the deep venous system

Entire leg swollen

Calf swelling >3 cm compared to asymptomatic leg

Pitting oedema confined to symptomatic leg

Collateral superficial veins (non-varicose)

Previously documented DVT

Alternative diagnosis at least as likely as DVT (−2 points)

How to Use the Wells DVT Calculator

Select 'Yes' for each clinical criterion present.
Note: 'Alternative diagnosis at least as likely' subtracts 2 points.
Click 'Calculate' to see the score and DVT probability.

Cas d'utilisation

•Pre-test probability assessment for suspected DVT.
•Guiding D-dimer and ultrasound ordering.
•Emergency department and outpatient clinical decision support.

Formule

Wells DVT Score: sum of clinical criteria. ≤0 = Low probability; 1–2 = Moderate; ≥3 = High. Alternative diagnosis likely scores −2.

Questions fréquemment posées

What is the Wells DVT score?

The Wells Score for DVT is a clinical prediction rule that estimates the pre-test probability of deep vein thrombosis. It helps guide decisions about further testing (e.g., D-dimer, ultrasound).

How is the score interpreted?

Score ≤0: Low probability (~5%). Score 1–2: Moderate probability (~17%). Score ≥3: High probability (~53%). A score ≤1 with negative D-dimer can rule out DVT.

Medical disclaimer

This calculator is for educational purposes only. It does not replace professional medical evaluation. Always consult a qualified healthcare provider for clinical decisions.