FEV1 (Forced Expiratory Volume in 1 second)

FEV1, or Forced Expiratory Volume in 1 second, measures how much air a person can forcefully exhale in the first second after taking a deep breath. It’s a key lung function test that helps assess how well the lungs are working. A lower FEV1 can indicate airway obstruction or lung diseases such as asthma or COPD. Doctors use FEV1 results to diagnose conditions, monitor disease progression, and evaluate treatment effectiveness. It provides an important snapshot of lung capacity and airflow, helping to identify respiratory issues early and guide appropriate management.