What does peak-flow testing measure?

Peak-flow testing measures forced expiratory volume from the lungs, specifically the maximum speed at which a person can exhale air from their lungs. This test is crucial in assessing lung function, particularly for individuals with respiratory conditions like asthma. By using a peak flow meter, patients can monitor their airflow, which helps in determining how well their lungs are functioning at different times.

This measurement is important for managing asthma and other chronic respiratory conditions because it provides insight into airway responsiveness and helps individuals and their healthcare providers identify when symptoms may be worsening. A decrease in peak flow readings can indicate airflow obstruction and the need for intervention, allowing for timely adjustments to treatment plans to prevent exacerbations.

The other options relate to different physiological measurements that are not specific to peak-flow testing. Heart rate monitoring pertains to cardiovascular health, oxygen levels are measured through pulse oximetry or arterial blood gas analysis, and sound waves traveling through the ear are related to auditory function. Each of these serves distinct purposes in the medical field but does not directly pertain to assessing lung function as peak-flow testing does.