Forced Vital Capacity (FVC) is a measure of the maximum amount of air a person can forcibly exhale after taking a deep breath. It is an important indicator of lung function and is often used in pulmonary function tests to assess respiratory health. FVC is typically measured in liters and can help diagnose conditions such as asthma, chronic obstructive pulmonary disease (COPD), and other lung disorders. A lower than normal FVC may indicate restricted lung capacity, while a normal or high FVC suggests healthy lung function.