What is the Wells Score for DVT?

The Wells Score (also called the Wells Criteria for DVT) is a validated clinical prediction rule developed by Dr. Philip Wells. It assigns points for specific clinical features and subtracts points when an alternative diagnosis is more plausible, producing a total score used to estimate the pre-test probability of DVT.

What does a Wells DVT score of 2 mean?

A score of 2 falls in the moderate probability range (1–2 points). Per the original scoring system, compression duplex ultrasonography is recommended. Under the revised two-tier system, a score of 2 is classified as "DVT likely" (score > 1), which also warrants imaging.

When can a D-dimer test replace imaging?

A negative high-sensitivity D-dimer can safely exclude DVT in patients with low pre-test probability (score ≤ 0 in the 3-tier system, or score ≤ 1 in the 2-tier "unlikely" category). In moderate or high probability patients, imaging is required regardless of D-dimer result.

What does the "alternative diagnosis" criterion mean?

If the clinician judges that another condition — such as cellulitis, muscle tear, or Baker's cyst rupture — is at least as plausible as DVT, 2 points are subtracted from the total score. This criterion reduces over-testing in patients with an obvious non-DVT explanation for their symptoms.

Does the Wells Score apply to upper-extremity DVT?

No. The Wells Criteria were validated for suspected lower-extremity DVT. A separate tool (the Constans score) exists for upper-extremity DVT risk stratification.

Is this calculator suitable for clinical use?

This tool is intended for educational and clinical decision-support purposes only. It does not replace physician assessment, clinical judgment, or locally approved protocols. Always confirm suspected DVT with compression duplex ultrasound or other appropriate imaging.

Wells Score DVT Calculator — Clinical Criteria & Probability

Summary

Enter 10 clinical findings to calculate the Wells DVT score and classify pre-test probability as low, moderate, or high.

How it works

Review each of the 10 clinical criteria in the checklist.
Check all findings that are present in the patient.
The tool adds +1 for each positive criterion and subtracts 2 if an alternative diagnosis is at least as likely as DVT.
The total score is classified using the original 3-tier system (low < 1, moderate 1–2, high ≥ 3) and the revised 2-tier system (unlikely ≤ 1, likely > 1).
Use the result alongside D-dimer testing or compression duplex ultrasound per your clinical protocol.
Tap Reset to clear all selections and start a new assessment.

Use cases

Stratify outpatients with suspected lower-limb DVT before ordering imaging.
Determine whether a negative D-dimer can safely rule out DVT in low-probability patients.
Support clinical documentation and structured DVT workup decisions.
Quickly recall all 10 Wells criteria at the bedside without a reference card.
Educate medical students and residents on evidence-based DVT risk scoring.
Triage emergency department patients presenting with unilateral leg swelling.
Cross-check mental arithmetic for Wells scoring accuracy in a busy clinical setting.

Wells Score for DVT Calculator

Clinical Criteria

Score & Interpretation