Wells Criteria for DVT
Score clinical findings to classify DVT pre-test probability as low, moderate, or high using the Wells Criteria.
Use the Wells Criteria for DVT
Clinical Criteria
Check all findings that apply to the patient. Points are shown on the right.
Result
For educational and clinical decision-support use only. Always apply local protocols and clinical judgment. This tool does not substitute for physician assessment.
Summary
The Wells Criteria for DVT is a validated clinical scoring system used to estimate the pre-test probability of deep vein thrombosis in patients presenting with leg symptoms. Developed by Dr. Philip Wells, the score combines eight clinical features plus an alternative-diagnosis criterion to classify patients into low, moderate, or high probability groups. Clinicians use this classification to guide decisions about imaging (Doppler ultrasound) and D-dimer testing.
How it works
- Check each clinical criterion that applies to the patient.
- The tool sums the points for all checked criteria.
- A score of 3 or more indicates high probability; 1–2 is moderate; 0 or below is low.
- Presence of an alternative diagnosis more likely than DVT subtracts 2 points.
- Review the result alongside D-dimer results and local clinical guidelines.
Use cases
- Stratify leg-swelling patients in the emergency department before ordering imaging.
- Decide whether a D-dimer test alone can safely rule out DVT in low-probability patients.
- Support clinical documentation for DVT workup decisions.
- Educate medical students and residents on evidence-based DVT risk stratification.
- Second-check a bedside Wells calculation for arithmetic accuracy.
- Triage outpatient referrals for suspected DVT.