Lung Volumes + Capacities

Tidal Volume (TV or VT)

normal range of volume as you take normal breaths

Inspiratory Reserve Volume (IRV)

maximum range of volume of air you can inhale IN ADDITION to the normal volume you inhale

Expiratory Reserve Volume (ERV)

maximum range of volume of air you can exhale IN ADDITION to the volume you normally exhale

Residual Volume (RV)

volume of air that never leaves your lungs

Obstructive

rate at which air can move into/out of lungs is reduced

Restrictive

ability of the lungs to expand is compromised and full proper volume cannot be achieved

FEV1

maximum volume of air a person can exhale in one second

FEV1/VC Ratio

the ratio should be about 80%

Vital Capacity (VC)

amount of air that lungs can expel after having been filled completely

Inspiratory Capacity (IC)

total volume of air that can be inhaled into the lungs after a normal expiration

Functional Residual Capacity (FRC)

volume of gas in lungs at the end of expiration

Total Lung Capacity (TLC)

total volume of air that can be contained in the lungs