Wells Score Calculator (DVT/PE)
Calculate the Wells score for estimating probability of deep vein thrombosis (DVT) or pulmonary embolism (PE). The Wells criteria combine clinical signs, risk factors, and alternative diagnoses to categorize patients as low, moderate, or high probability.
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Why: This page explains what the Wells Score calculator does, what to enter, and how to read the results—without repeating the overview above.
How: Enter your values in the calculator fields below, keep units consistent, then run the calculation to see results and any step-by-step work shown on this page.
Run the calculator when you are ready.
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For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.
The Wells Score combines 7 clinical criteria to estimate pulmonary embolism (PE) probability. Developed by Philip Wells and validated in multiple studies, it guides the diagnostic pathway: D-dimer testing for low-probability patients vs. direct imaging for high-probability. Two-tier (≤4 low, >4 high) and three-tier (0-1 very low, 2-6 moderate, ≥7 high) systems are both validated. Age-adjusted D-dimer (age × 10 ng/mL for patients >50) improves specificity.
Sources: Wells PS Lancet 2000; Kearon C Chest 2012.
Key Takeaways
- • Wells ≤4: Low probability; order D-dimer. Negative D-dimer excludes PE.
- • Wells >4: High probability; proceed to CTPA or V/Q. D-dimer adds little.
- • Three-tier: Very low (0-1) may omit D-dimer; moderate (2-6) requires D-dimer.
- • Age-adjusted D-dimer reduces false positives in patients >50.
Did You Know?
How Does Wells Score Work?
Scoring
Each criterion adds points. Clinical signs of DVT and PE as likely diagnosis each add 3. Heart rate >100, immobilization/surgery, previous VTE add 1.5 each. Hemoptysis and malignancy add 1 each.
Two-Tier
≤4 = PE unlikely (~12%). >4 = PE likely (~37-50%). Simple and widely used.
Three-Tier
0-1 very low (~1.3%), 2-6 moderate (~16%), ≥7 high (~41%). Allows D-dimer omission in very low risk.
Expert Tips
Wells Criteria Reference
| Criterion | Points |
|---|---|
| Clinical signs/symptoms of DVT | +3 |
| PE as #1 diagnosis or equally likely | +3 |
| Heart rate >100 bpm | +1.5 |
| Immobilization ≥3d or surgery in 4 weeks | +1.5 |
| Previous DVT/PE | +1.5 |
| Hemoptysis | +1 |
| Malignancy | +1 |
Frequently Asked Questions
What is the Wells Score for PE?
The Wells Score is a validated clinical prediction rule that estimates the probability of pulmonary embolism (PE) or deep vein thrombosis (DVT). It combines 7 clinical criteria to categorize patients as low (PE unlikely) or high (PE likely) probability. Scores ≤4 suggest low probability (~12% PE); scores >4 suggest high probability (~37-50% PE).
How is the Wells Score calculated?
Points are assigned: clinical signs of DVT (+3), PE as likely diagnosis (+3), heart rate >100 (+1.5), immobilization or surgery (+1.5), previous DVT/PE (+1.5), hemoptysis (+1), malignancy (+1). Total score determines risk tier. Two-tier: ≤4 low, >4 high. Three-tier: 0-1 very low, 2-6 moderate, ≥7 high.
When should D-dimer be ordered?
In low-probability patients (Wells ≤4), D-dimer testing is recommended. A negative D-dimer effectively excludes PE without imaging. In high-probability patients, proceed directly to CTPA or V/Q scan; D-dimer adds little value. Age-adjusted D-dimer (age × 10 ng/mL for patients >50) improves specificity.
What is the difference between two-tier and three-tier Wells?
Two-tier: ≤4 = PE unlikely, >4 = PE likely. Three-tier: 0-1 = very low (~1.3% PE), 2-6 = moderate (~16%), ≥7 = high (~41%). Three-tier allows very low-risk patients to potentially skip D-dimer. Both systems are validated; choose based on local protocol.
Who should use this calculator?
Emergency physicians, internists, and clinicians evaluating patients with suspected PE. The Wells Score guides the diagnostic pathway: D-dimer vs. direct imaging. It should complement, not replace, clinical judgment. Pregnant patients and those with high bleeding risk need individualized decisions.
Can this replace medical advice?
No. This tool is for educational purposes only. Clinical decisions require professional assessment. Always consult a qualified healthcare provider. Do not use for self-diagnosis or to delay seeking care for chest pain, shortness of breath, or suspected PE.
Key Statistics
Official Data Sources
⚠️ Disclaimer: This calculator is for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider. Do not use for self-diagnosis. Seek emergency care for chest pain, severe shortness of breath, or suspected PE.
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