About this calculator
The two-level Wells score estimates clinical pretest probability for suspected deep vein thrombosis. It should be used with clinical assessment and diagnostic pathways such as D-dimer testing and ultrasound, not as a stand-alone rule-out tool.
Two-level DVT Wells score: DVT likely if score ≥2; DVT unlikely if score ≤1. Alternative diagnosis at least as likely subtracts 2 points.
Source-mapped clinical pretest-probability score
Wells DVT score estimates pretest probability and must be combined with D-dimer rules, ultrasound access, symptoms, and local diagnostic pathways.
Formula and method
Add 1 point for each Wells DVT criterion present, subtract 2 points if an alternative diagnosis is at least as likely as DVT. Score ≥2 = DVT likely; score ≤1 = DVT unlikely in the two-level model.
Limitations and when not to rely on this result
- Wells DVT score estimates pretest probability and must be combined with D-dimer rules, ultrasound access, symptoms, and local diagnostic pathways.
- Do not rely on this page for suspected pulmonary embolism, severe symptoms, pregnancy, anticoagulated patients, or urgent deterioration.
- Seek urgent clinical care for chest pain, shortness of breath, fainting, coughing blood, or rapidly worsening leg symptoms.
Frequently asked questions
What does the Wells DVT score estimate? +
It estimates clinical pretest probability of DVT based on symptoms, history, and exam features.
Can Wells score rule out DVT alone? +
No. Guidelines use Wells score together with D-dimer testing and/or ultrasound pathways.
What score means DVT likely? +
In the two-level model, a score of 2 or more is considered DVT likely.
What if I have chest pain or shortness of breath? +
Those may be pulmonary embolism symptoms and require urgent medical assessment.
Does this apply to hospitalized patients? +
Clinical prediction rules may perform differently in hospitalized or complex patients, so clinician judgment is important.