What most naturally follows?

How to take a spirometry test
Avoid activities which might affect your normal lung function.
To ensure accurate results, you need to take the following precautions in the hours leading up to the test :
Ask your healthcare provider which medications you should avoid on the day of the test. Do not smoke within 24 hours of the test.
Do not drink alcohol within 4 hours of the test. Do not exercise strenuously within 30 minutes of the test.