Calculator Form
Example Data Table
| Case | DVT Signs | PE Most Likely | Heart Rate | Immobilization / Surgery | Previous VTE | Hemoptysis | Malignancy | Total Score | Two-tier |
|---|---|---|---|---|---|---|---|---|---|
| Example A | Yes | Yes | 112 bpm | Yes | No | No | No | 9.0 | PE likely |
| Example B | No | No | 88 bpm | No | No | Yes | Yes | 2.0 | PE unlikely |
| Example C | No | No | 96 bpm | Yes | Yes | No | No | 3.0 | PE unlikely |
Formula Used
The calculator adds the weighted values of seven Wells PE criteria. Criteria are binary except for heart rate, which adds 1.5 points only when the value is greater than 100 beats per minute.
Two-tier interpretation: below 4.5 = PE unlikely; 4.5 or higher = PE likely.
Reference probability band: 0 to 4.0 = low; 4.5 to 6.0 = moderate; 6.5 or higher = high.
Optional D-dimer note: threshold is 500 µg/L at age 50 or younger, otherwise age × 10 µg/L.
How to Use This Calculator
Enter patient identifiers only if needed for internal documentation. Add age and heart rate first, because they affect the optional D-dimer note and the tachycardia criterion.
Select Yes or No for each Wells PE criterion based on the clinical presentation. The tool automatically assigns the correct point value for each positive finding.
Click the calculate button to show the total score under the header and above the form. Review the two-tier interpretation, breakdown table, and graph.
Use the CSV button for spreadsheet-friendly output and the PDF button for a printable summary. Keep the note section concise so exported reports remain clean.
Use the result as structured documentation support. It should complement, not replace, full medical assessment, local pathways, and imaging decisions.
Frequently Asked Questions
1) What does the Wells PE score estimate?
It estimates the pretest probability of pulmonary embolism using weighted bedside criteria. It supports structured assessment but does not confirm or exclude diagnosis by itself.
2) Why does heart rate use a threshold?
The Wells method adds points only when heart rate is above 100 beats per minute. A normal or lower rate does not contribute points in this rule.
3) Why are there two interpretation styles shown?
The page shows the common two-tier pathway and a reference three-band probability view. This helps with documentation, teaching, and pathway comparison.
4) Does this calculator diagnose pulmonary embolism?
No. It is a structured scoring aid. Diagnosis depends on overall clinical judgment, protocols, testing strategy, and imaging when indicated.
5) Why is D-dimer optional here?
The Wells score itself does not require D-dimer to compute the point total. This page adds an optional threshold note for documentation support.
6) Can I use this for printed chart notes?
Yes. The export buttons generate a structured summary with patient fields, score, interpretation, and criterion breakdown for local record workflows.
7) What if some information is uncertain?
Use the best documented clinical information available. If an item is uncertain, document that uncertainty clearly rather than forcing a positive selection.
8) Is the tool useful for teaching?
Yes. The breakdown table and Plotly graph make the weighted structure easy to review during study sessions, audits, and clinical education.