Wells Score for DVT
Calculate the Wells score for deep vein thrombosis and see whether DVT is likely or unlikely, with the two-tier and three-tier interpretations. Educational tool only.
The Wells score for deep vein thrombosis comes from Wells and colleagues (1997, revised 2003). Ten criteria are counted: nine score 1 point each and an alternative diagnosis at least as likely as DVT scores โ2. A total of 2 or more means DVT is โlikelyโ, selecting proximal leg vein ultrasound; 1 or below means โunlikelyโ, selecting a D-dimer first. An โunlikelyโ score does not exclude DVT on its own. The score is a pre-test probability aid, not a diagnosis, and the calf-circumference criterion assumes a measured difference rather than a visual impression.
Frequently asked questions
What is the Wells score for DVT?
It is a clinical prediction rule that estimates pre-test probability of deep vein thrombosis from ten criteria. Nine criteria add 1 point and an alternative diagnosis at least as likely as DVT subtracts 2 points.
What Wells score means DVT is likely?
In the current two-tier form, a score of 2 or more means DVT likely and a score of 1 or less means DVT unlikely. The result selects the next diagnostic step; it does not confirm or exclude DVT by itself.
What is the difference between the two-tier and three-tier Wells DVT scores?
The two-tier form groups results into DVT likely or unlikely and is used in current UK pathways. The older three-tier interpretation labels scores as high, moderate or low probability; this calculator shows both without treating either as a diagnosis.
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