What does the Wells Asthma Score measure?

It estimates the pre-test clinical probability of asthma based on presenting symptoms, history, and examination findings. A higher score means a higher likelihood of asthma.

What score indicates high probability?

A total score of 5 or above is classified as high probability. Scores of 3-4 are moderate, and 0-2 are low probability.

Does a high score confirm an asthma diagnosis?

No. This tool estimates probability only. Objective confirmation (spirometry, peak flow variability, or bronchoprovocation testing) is still required for a definitive diagnosis.

Can I use this for pediatric patients?

The Wells criteria were primarily validated in adults. Pediatric asthma diagnosis relies on different clinical criteria; consult age-appropriate guidelines.

Is this tool a substitute for clinical judgment?

No. It is a decision-support aid. Always integrate the score with the full clinical picture, patient history, and local guidelines.

Wells Asthma Score

Name: Wells Asthma Score
Availability: InStock
Author: Nham Vu

Check clinical criteria and get a Wells score that classifies asthma diagnosis probability as low, moderate, or high.

Clinical Criteria

Check every item that applies to the patient.

Wheeze on auscultation +2 pts Symptoms vary with season or allergen exposure +2 pts Recurrent wheeze (more than one episode) +1 pt Nocturnal symptoms (cough or wheeze) +1 pt Symptoms worsen with exercise +1 pt Symptoms improve with bronchodilator use +1 pt History of atopic disease (eczema, allergic rhinitis, or food allergy) +1 pt Family history of asthma or atopic disease +1 pt Current smoker (20+ pack-years) — lowers asthma probability -1 pt

Result

Total Score 0 out of 10 max

Enter criteria to see probability

Score Bands

0 – 2 Low probability

3 – 4 Moderate probability

5 + High probability

For clinical decision support only. Objective confirmation (spirometry, peak flow monitoring, or bronchoprovocation testing) is required for a definitive asthma diagnosis.

Summary

Check clinical criteria and get a Wells score that classifies asthma diagnosis probability as low, moderate, or high.

How it works

Select each criterion that applies to the patient.
Points are assigned automatically for each checked item.
The total score is calculated instantly.
The result is classified as low (0-2), moderate (3-4), or high (5+) probability.
Use the classification alongside clinical judgment to guide next steps.

Use cases

Screen patients presenting with recurrent cough, wheeze, or breathlessness.
Guide spirometry or bronchoprovocation testing decisions.
Document pre-test probability in referral letters.
Educate medical students on structured asthma probability assessment.

Frequently Asked Questions

Last updated: 2026-06-11 · Reviewed by Nham Vu