Forced expiratory volume (FEV)

Definition

Forced Expiratory Volume (FEV) is the amount of air a person can forcefully exhale in one second. It is often measured during a spirometry test to assess lung function and diagnose respiratory conditions.

5 Must Know Facts For Your Next Test

1. FEV1 represents the volume exhaled in the first second of a forced breath.
2. A lower FEV1 value may indicate obstructive lung diseases such as asthma or chronic obstructive pulmonary disease (COPD).
3. The FEV1/FVC ratio is used to differentiate between obstructive and restrictive lung diseases.
4. Normal FEV1 values vary based on age, sex, height, and ethnicity.
5. Spirometry tests including FEV measurements are non-invasive and commonly used in clinical settings.

Review Questions

• What does FEV1 measure?
• How can FEV1 values help diagnose respiratory conditions?
• What factors can affect normal FEV1 values?

Related terms

Spirometry: A common pulmonary function test that measures lung function, including FEV and FVC.

FVC (Forced Vital Capacity): The total amount of air exhaled during a forced breath.

Obstructive Lung Disease: A category of respiratory disease characterized by airway obstruction, often diagnosed using FEV measurements.