In spirometry testing, what additional step is required compared to peak-flow testing?

In spirometry testing, avoiding smoking for at least 1 hour before the test is essential for obtaining accurate results. Smoking can temporarily affect lung function and lead to misleading spirometry measurements, which directly assess the volume and flow of air that can be inhaled and exhaled. By refraining from smoking leading up to the test, the individual can ensure that the results reflect their true pulmonary function rather than the transient effects of tobacco use.

While peak-flow testing is a less comprehensive measure of lung function that primarily determines the maximum speed of exhalation, spirometry requires more controlled conditions to ensure accuracy. The requirements for abstaining from smoking are part of a broader set of protocols that enhance the reliability of spirometry results, including proper technique and environmental factors.

The other options do not pertain specifically to the additional steps required in spirometry compared to peak-flow testing, making them less relevant in this context. Overall, smoking avoidance is a critical aspect that distinguishes the preparation needed for spirometry from that required for peak-flow testing.