Wells Score for Pulmonary Embolism

Pretest probability for pulmonary embolism using the Wells criteria.

Wells

Patient parameters

Adjust values, then click Calculate.

PE more likely than alternative diagnosis

Hemoptysis

Immobilization or surgery in prior 4 weeks

Previous DVT or PE

Heart rate > 100 bpm

Results

Wells PE score: 0 points

What this calculator does

The Wells score estimates pretest probability of pulmonary embolism before imaging. It combines clinical signs, risk factors, and whether an alternative diagnosis is likely.

Formula and variables

Displayed formula: Wells

The engine evaluates: Wells PE score (points). Variable names match the input field keys so you can trace each step from entry to output.

How to use this tool

1. Open the Wells Score for Pulmonary Embolism and enter your values using the units shown beside each field.
2. Review that inputs are within the typical physiological range before you calculate.
3. Read the result together with the interpretation notes below and your local clinical context.

How to interpret the result

Low scores favor ruling out PE when paired with negative D-dimer in appropriate populations. Moderate and high scores warrant imaging such as CT pulmonary angiography per local pathways.

Clinical context

Severity scores guide triage and monitoring frequency. They do not replace clinician judgment, serial exams, or escalation when the patient appears unwell despite a low score.

Limitations and disclaimer

This tool supports education and clinical triage only. It does not replace professional medical advice, diagnosis, or treatment. Reference ranges vary by laboratory, age, pregnancy status, and comorbidity. Always confirm critical decisions with institutional protocols and qualified clinicians.