FEV1 stands for what measurement?

FEV1 stands for what measurement?

• A. Forced expiratory volume in 1 second; airflow obstruction measure.
• B. Forced expiratory volume in 2 seconds; overall lung capacity.
• C. Forced vital capacity.
• D. Oxygen saturation during exercise.

Answer: (A)

FEV1 is the amount of air you can forcefully exhale in the first second of a forced breath. It’s a central spirometry measure that reflects how quickly air can move through the airways, so it’s especially useful for detecting and assessing airway obstruction, as seen in asthma or COPD. Clinically, it’s often considered with FVC (the total forced exhaled volume) to form the FEV1/FVC ratio, which helps determine the presence and severity of obstruction. The other options describe different concepts: a two-second exhale isn’t the standard measure, forced vital capacity is the total exhaled volume rather than the first-second rate, and oxygen saturation during exercise is about blood oxygen levels, not lung volume.

FEV1 is the amount of air you can forcefully exhale in the first second of a forced breath. It’s a central spirometry measure that reflects how quickly air can move through the airways, so it’s especially useful for detecting and assessing airway obstruction, as seen in asthma or COPD. Clinically, it’s often considered with FVC (the total forced exhaled volume) to form the FEV1/FVC ratio, which helps determine the presence and severity of obstruction. The other options describe different concepts: a two-second exhale isn’t the standard measure, forced vital capacity is the total exhaled volume rather than the first-second rate, and oxygen saturation during exercise is about blood oxygen levels, not lung volume.