Calculator Form
Example Data Table
| Case | Key Findings | Score | Interpretation |
|---|---|---|---|
| Case A | Entire leg swollen, calf swelling, tenderness, previous DVT | 4 | DVT likely |
| Case B | Pitting edema only, alternative diagnosis also likely | -1 | DVT unlikely |
| Case C | Bedridden, active cancer, collateral veins | 3 | DVT likely |
Formula Used
The calculator adds one point for each positive Wells criterion and subtracts two points when an alternative diagnosis is at least as likely as DVT.
Formula: Total Wells Score = sum of selected positive findings − 2 if an alternative diagnosis is at least as likely.
Interpretation: A total of 2 or more is classified as DVT likely. A total of 1 or less is classified as DVT unlikely.
How to Use This Calculator
- Enter patient and assessment details you want included in the report.
- Mark each Wells criterion that is present at the bedside.
- Enter optional D-dimer and local laboratory threshold values if available.
- Select Calculate Score to display the result above the form.
- Review the scoring table, interpretation, and suggested next-step pathway.
- Use the export buttons to save the completed assessment as CSV or PDF.
Important Note
This tool supports structured documentation and education. It does not replace clinical judgment, local protocols, imaging, or urgent medical evaluation.
FAQs
1. What does this calculator estimate?
It estimates the clinical probability of lower-limb DVT using the two-level Wells rule. It helps organize bedside findings before D-dimer testing or compression ultrasound.
2. Is this calculator diagnostic by itself?
No. A Wells score supports pretest probability assessment. Diagnosis still depends on imaging, laboratory testing, clinician judgment, and the wider clinical picture.
3. Why can the total score become negative?
The model subtracts two points when another diagnosis appears at least as likely as DVT. That reduces the estimated pretest probability.
4. What score means DVT is likely?
A total score of 2 or more falls into the likely category. Scores of 1 or less fall into the unlikely category.
5. Why include D-dimer fields here?
The score and D-dimer are often used together in diagnostic pathways. These optional fields help document the entered value and compare it with a local laboratory threshold.
6. Can I use this for recurrent DVT?
You can document the bedside score, but recurrent DVT often needs comparison with prior imaging. Specialist review or local protocols may be important.
7. Are both legs suitable for this score?
The Wells criteria were built around suspected lower-extremity DVT, usually with asymmetry. Bilateral symptoms may require broader differential diagnosis and further assessment.
8. Who might benefit from this page?
Clinicians, trainees, educators, and audit teams can use it for teaching, structured notes, quick bedside review, and exportable case documentation.