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