What does a Wells DVT score of 2 or more mean?

A score of 2 or more indicates moderate to high pre-test probability of DVT. Clinical guidelines typically recommend proceeding directly to compression ultrasonography rather than relying on D-dimer alone.

Can I use this tool to diagnose DVT?

No. The Wells score is a clinical decision-support aid, not a diagnostic test. Always confirm suspected DVT with compression duplex ultrasound or other imaging. This calculator is for educational purposes only.

What is the "alternative diagnosis at least as likely" criterion?

If the clinician judges that another diagnosis (such as cellulitis, muscle tear, or Baker cyst rupture) is at least as plausible as DVT, 2 points are subtracted from the score. This prevents over-testing in patients with obvious alternative explanations.

Does this calculator cover upper-extremity DVT?

No. The original Wells criteria were validated for lower-extremity DVT. Separate scoring systems (such as the Constans score) exist for upper-extremity DVT.

How is "immobilization" defined in the Wells criteria?

Immobilization includes any period of paralysis, paresis, or plaster cast immobilization of the lower extremity, as well as bed rest for 3 or more days or major surgery within the previous 12 weeks.

Is the Wells score validated?

Yes. The Wells criteria for DVT have been validated in multiple prospective studies and are endorsed by major thrombosis and emergency medicine guidelines worldwide.

Wells DVT Score Calculator

Name: Wells DVT Score Calculator
Availability: InStock
Author: Nham Vu

Score 9 clinical criteria to estimate the pre-test probability of deep vein thrombosis (DVT).

Summary

Score 9 clinical criteria to estimate the pre-test probability of deep vein thrombosis (DVT).

How it works

Review each of the 9 clinical criteria listed on the left.
Check the box for each criterion that applies to the patient.
The calculator sums your selections and applies the Wells scoring rules.
The total score is interpreted as low (< 1), moderate (1–2), or high (≥ 3) pre-test probability.
Use the result alongside D-dimer tests or compression ultrasound per your clinical protocol.

Use cases

Stratify outpatients with suspected lower-limb DVT before ordering imaging.
Decide whether a negative D-dimer can safely rule out DVT in low-risk patients.
Support clinical reasoning in emergency department triage for leg swelling.
Educate medical students on validated DVT risk stratification tools.
Document pre-test probability as part of a structured DVT workup.
Quickly recall all 9 Wells criteria without consulting a reference card.

Frequently Asked Questions

Related tools

Wells Criteria Pe Caprini Score Padua Score

Last updated: 2026-05-23 · Reviewed by Nham Vu