RESPIRATORY VOLUME MEASUREMENTS

 

 

MEASUREMENT

DESCRIPTION

NORMAL VALUE

 

Tidal Volume

(TV)

Quantity of air moved into and out of the lungs during a normal breath

 

 

500ml

Minute Respiratory Volume

(MRV)

Quantity of air moved into and out of the lungs in one minute

(MRV= TV X Respiratory Rate)

 

 

6000 ml/min

Inspiratory Reserve Volume

(IRV)

Quantity of air that can be forcefully inspired after a normal tidal inspiration

 

 

3000 ml

Expiratory Reserve Volume

(ERV)

Quantity of air that can be forcefully expired after a normal tidal expiration

 

 

1200 ml

Vital Capacity

(VC)

Maximum quantity of air that can be moved into and out of the lungs

(VC= IRV + TV + ERV)

 

 

4500-5500 ml

Functional Residual Capacity

(FRC)

Quantity of air remaining in the lungs after a normal expiration

(FRC = ERV + RV)

 

 

2400 ml

Residual Volume

(RV)

Quantity of air remaining in the lungs after a maximal expiration

 

 

1200 ml

Total Lung Capacity

(TLC)

Maximum quantity of air the lungs can hold

(TLC = VC + RV)

 

 

4400-6400 ml