Bronchodilator Responsiveness
Bronchodilator responsiveness (ATS/ERS 2022): % change = 100 x (post - pre) / predicted for FEV1 or FVC; a change > 10% of predicted is a significant response.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Pre-bronchodilator FEV1 or FVC
- 2.0 L
- Post-bronchodilator FEV1 or FVC
- 2.4 L
- Predicted FEV1 or FVC
- 3.0 L
Result: Bronchodilator response 13.3% of predicted — significant (> 10%).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- <= 10%
- Not a significant response.
- > 10%
- Significant bronchodilator response (100 x (post - pre) / predicted; legacy criterion >= 12% AND >= 200 mL). A spirometry index, not a diagnosis.
What you enter
- Pre-bronchodilator FEV1 or FVC
- Post-bronchodilator FEV1 or FVC
- Predicted FEV1 or FVC
How this is calculated
Stanojevic S, Kaminsky DA, Miller MR, et al. ERS/ATS technical standard on interpretive strategies for routine lung function tests. Eur Respir J. 2022;60(1):2101499. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.