| Tidal Volume (TV) |
Air in/out during quiet breathing |
Yes |
| Inspiratory Reserve (IRV) |
Extra inhalation after normal inspiration |
Yes |
| Expiratory Reserve (ERV) |
Extra exhalation after normal expiration |
Yes |
| Residual Volume (RV) |
Air remaining after maximal exhalation |
No (requires helium dilution/body plethysmography) |
| Vital Capacity (VC) |
TV + IRV + ERV |
Yes |
| Functional Residual Capacity (FRC) |
ERV + RV |
No |
| Total Lung Capacity (TLC) |
VC + RV |
No |