What does the forced expiratory volume in one second (FEV1) test measure?

The forced expiratory volume in one second (FEV1) test measures the amount of air a person can forcibly exhale in one second after taking a deep breath. This measurement is critical for assessing lung function and can help diagnose and monitor various respiratory conditions, such as asthma and chronic obstructive pulmonary disease (COPD).

FEV1 provides insight into the flow rate of air from the lungs, indicating how quickly air can be expelled. This test is essential for understanding the efficiency of the lungs and can reflect the presence of airway obstruction.

Understanding this concept is crucial for professionals involved in respiratory health, particularly when evaluating the impact of hazardous substances, such as asbestos, on lung function. This context provides a compelling reason for the significance of FEV1 in lung health assessments.