Lung volumes

##Diagram 20050306(5) - "Lung volumes"

 

Basic volumes and capacity

Volume

Residual volume (RV) = 15-20 mL/kg

Expiratory reserve volume (ERV) = 15 mL/kg

Tidal volume (VT) = 7 mL/kg

Inspiratory reserve volume (IRV) = 45 mL/kg

Capacity

Total lung capacity (TLC)
= RV + ERV + VT + IRV
= about 75-80 mL/kg

Vital capacity (VC)
= ERV + VT + IRV
= about 60-70 mL/kg

Functional residual capacity (FRC)
= RV + ERV
= 30 mL/kg

Inspiratory capacity
= VT + IRV

Expiratory capacity
= ERV + VT

Volume vs capacity

Volumes are the base units

Capacities are combinations of two or more base volumes

 

 

 

 

 

Additional notes

To be added later

Details about FRC

Measurement of FRC, RV