Wells Score for DVT Calculator
The Wells score for deep vein thrombosis (DVT) estimates the pre-test probability of a leg DVT from nine clinical criteria, helping decide whether a D-dimer or ultrasound is the right next test.
Quick answer
The Wells score for DVT adds nine clinical findings (and subtracts 2 if another diagnosis is at least as likely) to estimate the probability of a leg deep vein thrombosis. A score of 2 or more is "DVT likely"; under 2 is "DVT unlikely", where a negative D-dimer can rule it out.
Wells DVT criteria
DVT unlikely
A modified Wells DVT score of 0 β DVT unlikely. In the dichotomised rule, a score β₯ 2 is βDVT likelyβ (proceed to ultrasound), and < 2 is βDVT unlikelyβ (a negative high-sensitivity D-dimer can safely exclude DVT). Your clinician chooses the pathway.
How to use the Wells DVT calculator
- 1Tick the clinical criteria. Tick each Wells DVT criterion present, such as active cancer, leg swelling, calf swelling over 3 cm, and previously documented DVT.
- 2Account for alternatives. Tick "alternative diagnosis at least as likely" to subtract 2 points if another cause is equally or more probable.
- 3Read likely vs unlikely. A total of 2 or more is "DVT likely" (ultrasound); under 2 is "DVT unlikely" (a negative high-sensitivity D-dimer can exclude DVT).
Medical disclaimer: This is general health information, not medical advice. It does not diagnose or treat any condition, and the results are estimates based on public reference formulas. Always consult a qualified doctor about your individual health. If you think you may have a medical emergency, contact your local emergency services immediately.
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Book a consultationFrequently asked questions
What Wells DVT score means DVT is likely?β
In the dichotomised rule, a score of 2 or more means DVT is "likely" and usually leads to a compression ultrasound. Under 2 is "unlikely".
Can the Wells score rule out a DVT on its own?β
Not by itself. A low Wells score combined with a negative high-sensitivity D-dimer can safely exclude DVT; otherwise imaging is needed. A clinician decides.
Is this the modified Wells score?β
Yes β it includes the "previously documented DVT" point and the β2 for an equally likely alternative diagnosis, as in the 2003 modified rule.
Sources & validation
This calculator reproduces the published Wells DVT score, validated for pre-test probability of lower-limb deep vein thrombosis.
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