Spirometry measures airflow over time. It provides two numeric values that are helpful in the assessment and monitoring of patients with impaired lung function.
Forced Vital Capacity (FVC): total amount of air that can be exhaled following as deep
an inhalation as possible
Forced Expiratory Volume measured over one second (FEV1): the flow of air during the
first second of the Forced Vital Capacity
FEV1/FVC: the proportion of air in a person’s lungs that can be blown out in one second