Expiratory reserve volume (ERV)

Definition

Expiratory reserve volume is the additional amount of air that can be forcibly exhaled after the completion of a normal, passive exhalation. It measures lung function and is an important component of pulmonary capacity tests.

Related terms

Tidal Volume:

The amount of air inhaled or exhaled during normal breathing with each breath.

Vital Capacity:

The maximum amount of air a person can expel from the lungs after maximum inhalation, including tidal volume and all reserve volumes.

Residual Volume:

The volume of air remaining in the lungs after a maximal expiratory effort, ensuring that the lungs do not collapse