flow volume loops normal definition
- related: PFT and lung functions
- tags: #permanent
- TLC: average person, 6 L total
- RV: 1 L residual volume
- TV: quiet breathing, 2.5 - 3L
- Inspiratory Reserve Volume: volume inhaled after inspiration TV
- ERV: same with expiration TV
- FRC: functional residual capacity, volume left after TV expiration
- VC: everything but residual volume
- IRV
- TV
- ERV
- RV
- bottom 2: FRC
- top 2: IC
- top 3: VC
- all 4: TLC
Links to this note
- PFT and lung functions
- airflow obstruction happens first in distal airways
- FEF\_{25-75%} are sometimes used to describe this decrease in small airway flow between 25% and 75% of exhaled FVC (flow volume loops normal definition). However the measurements are widely variable and thus not used.1