What does Forced Vital Capacity (FVC) measure?

Forced Vital Capacity (FVC) is a crucial spirometric measure in respiratory physiology. It quantifies the amount of air that can be forcefully exhaled after taking the deepest possible inhalation. This measurement is significant because it provides valuable information about lung function and the presence of respiratory conditions. In individuals with obstructive or restrictive lung diseases, FVC can help clinicians assess the degree of lung impairment and guide diagnosis and treatment.

The focus on evaluating the volume of air exhaled in a forceful manner after a full inspiration distinguishes FVC from other respiratory measurements. For instance, measuring the maximum air inspired in one breath represents tidal volume, and assessing the residual volume pertains to the air remaining in the lungs after a maximal exhalation, which is not directly related to the FVC measurement. Total lung capacity involves the total volume of air in the lungs at maximum inflation and thus encompasses multiple components beyond just the forced vital capacity alone.