Spirometry values, lung volumes and capacities, and obstructive versus restrictive pattern interpretation for pulmonary function testing.
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- FVC stands for
- Forced vital capacity
- FEV1 stands for
- Forced expiratory volume in one second
- FEV1/FVC ratio is used to distinguish
- Obstructive lung disease from restrictive lung disease
- A reduced FEV1/FVC ratio (below about 70 percent) indicates
- An obstructive pattern
- A normal or increased FEV1/FVC ratio with reduced FVC indicates
- A restrictive pattern
- Classic obstructive lung diseases include
- COPD and asthma
- Classic restrictive lung diseases include
- Pulmonary fibrosis and chest wall deformities
- Total lung capacity (TLC) is defined as
- The total volume of air in the lungs after a maximal inspiration
- Residual volume (RV) is defined as
- The volume of air remaining in the lungs after a maximal exhalation
- Functional residual capacity (FRC) is defined as
- The volume of air remaining in the lungs after a normal, passive exhalation
- FRC is the sum of
- Residual volume plus expiratory reserve volume
- Vital capacity (VC) is defined as
- The maximum volume exhaled after a maximal inhalation
- Tidal volume (VT) is defined as
- The volume of air moved in or out of the lungs during normal, quiet breathing
- Inspiratory reserve volume (IRV) is defined as
- The additional volume that can be inhaled beyond a normal tidal inspiration
- Expiratory reserve volume (ERV) is defined as
- The additional volume that can be exhaled beyond a normal tidal exhalation
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