How is the modified Wells score for recurrent DVT different from the standard Wells DVT score?

The standard Wells score is used for a first episode of DVT. The modified Wells score for recurrence adjusts several criteria to account for the fact that prior DVT is itself a risk factor. The two tools use overlapping but distinct item sets and cut-points validated in recurrent-DVT cohorts rather than first-episode populations.

What score is considered "DVT likely" vs. "DVT unlikely"?

A score of 2 or higher places the patient in the "DVT likely" category, where bilateral compression ultrasound is generally recommended. A score of 1 or lower is "DVT unlikely" and D-dimer testing may be sufficient to rule out recurrence.

Can I rely on this score alone to exclude recurrent DVT?

No. A low Wells score combined with a negative D-dimer result substantially reduces the probability of recurrent DVT, but clinical judgment, patient history, and additional testing must guide the final decision. This calculator is a decision-support aid, not a standalone diagnostic test.

What counts as "prior documented DVT" in the scoring?

A prior DVT that was objectively confirmed by compression ultrasound, venography, or another imaging study. Clinical suspicion alone or a patient-reported history without objective confirmation does not qualify.

Does this tool store patient data?

No. All calculations run entirely in your browser. No data is transmitted to any server.

Wells Criteria for Recurrent DVT — Probability Score Calculator

Variable	Pts
Total

Summary

Score 8 clinical variables to determine the pre-test probability of recurrent DVT and guide decisions about compression ultrasound and D-dimer testing.

How it works

Select Yes or No for each of the 8 clinical variables listed in the scoring panel.
The calculator sums the points in real time and displays the total score.
A score of 2 or higher indicates DVT is likely; consider compression ultrasound of both legs.
A score of 1 or lower indicates DVT is unlikely; D-dimer testing may be used to exclude recurrence.
Review the interpretation panel for the recommended diagnostic pathway.
This tool is for clinical decision support only — combine with full clinical assessment.

Use cases

Assess pre-test probability of recurrent DVT in patients with a prior VTE history.
Guide the decision to order bilateral compression ultrasound vs. D-dimer first.
Triage emergency department patients presenting with leg swelling and prior DVT.
Support anticoagulation management decisions after a suspected recurrent event.
Teach residents and students about the modified Wells score for DVT recurrence.
Document clinical risk stratification in medical notes.

Wells Criteria for Recurrent DVT

Clinical Variables

Result