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Wells Score for DVT Calculator

The Wells score for deep vein thrombosis (DVT) estimates pre-test probability from the leg examination and history. Its distinctive feature is the final item: if another diagnosis is at least as likely as DVT, two points come off — a reminder that the score formalizes, rather than replaces, the clinical story.

Formula: Sum the points: nine features score +1 each; an alternative diagnosis at least as likely as DVT scores −2.

Enter the values or tick the options above — the result updates automatically.

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How to interpret the result

ModelScoreGrouping
Two-tier1 or belowDVT unlikely
Two-tier2 or aboveDVT likely
Three-tier0 or belowLow probability
Three-tier1–2Moderate probability
Three-tier3 or aboveHigh probability

The score was designed for symptomatic outpatients being assessed for a possible first DVT — it is not validated for screening people without symptoms, or for suspected clots in the arm.

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Frequently asked questions

What is the minus-2 item in the Wells DVT score?

If an alternative diagnosis — for example a muscle strain, cellulitis, or a ruptured Baker's cyst — is at least as likely as DVT, subtract 2 points. It is the only negative item and it keeps clinical judgment inside the score.

What Wells DVT score is "likely"?

In the two-tier model, 2 or more is "DVT likely" and 1 or below is "unlikely". The three-tier model uses 0 or below for low, 1–2 for moderate, and 3 or above for high probability.

Does a low Wells score rule out DVT on its own?

No. In validated pathways a low or "unlikely" score is combined with a D-dimer test; imaging decisions follow the combination, not the score alone.

Educational use only. This calculator is an aid to learning and does not replace clinical judgment, local reference ranges, or specialist advice. Always interpret a result alongside the patient, the full laboratory picture, and your laboratory's own reference ranges.