Wells DVT Score Calculator
Quick answer: The Wells DVT score helps estimate the pretest probability of deep vein thrombosis (DVT) using clinical features.
Wells Score: DVT Probability
Interpretation
- ≤0 points: Low probability (~5% have DVT)
- 1–2 points: Moderate probability (~17% have DVT)
- ≥3 points: High probability (~53% have DVT)
Source: Wells PS, et al. Evaluation of D-dimer in the diagnosis of suspected deep-vein thrombosis. N Engl J Med. 2003;349(13):1227-35.
Frequently asked questions
How is the Wells score used clinically?
Combined with D-dimer testing and compression ultrasound, the Wells score guides DVT workup. Low probability + negative D-dimer effectively rules out DVT. Moderate/high probability typically requires ultrasound.
Is the Wells score validated for outpatients?
Yes. The original Wells score was validated in outpatients with suspected DVT. It has been broadly validated since, and is recommended in major guidelines (ACCP, ESC) for the initial assessment.
Should I use Wells score in pregnancy?
Standard Wells score is less validated in pregnancy. Pregnancy-specific scores (LEFt rule) and clinical judgment are preferred. Always consult specialist obstetric guidance.
What is D-dimer's role?
D-dimer is a sensitive but non-specific marker of clot formation/breakdown. A low D-dimer in low/moderate Wells score effectively rules out DVT. High D-dimer alone does not confirm DVT — imaging is required.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.