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Vital capacity (VC) is the maximum amount of air a person can expel from the lungs after a maximum inhalation. It is equal to the sum of inspiratory reserve volume, tidal volume, and expiratory reserve volume. It is approximately equal to Forced Vital Capacity (FVC). [1] [2] A person's vital capacity can be measured by a wet or regular spirometer.
Functional residual capacity: the volume in the lungs at the end-expiratory position: RV/TLC% Residual volume expressed as percent of TLC: V A: Alveolar gas volume: V L: Actual volume of the lung including the volume of the conducting airway. FVC: Forced vital capacity: the determination of the vital capacity from a maximally forced expiratory ...
TLC: Total lung capacity: the volume in the lungs at maximal inflation, the sum of VC and RV. TV: Tidal volume: that volume of air moved into or out of the lungs in 1 breath (TV indicates a subdivision of the lung; when tidal volume is precisely measured, as in gas exchange calculation, the symbol TV or V T is used.)
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Functional residual capacity: the volume in the lungs at the end-expiratory position: RV/TLC% Residual volume expressed as percent of TLC: V A: Alveolar gas volume: V L: Actual volume of the lung including the volume of the conducting airway. FVC: Forced vital capacity: the determination of the vital capacity from a maximally forced expiratory ...
Vital capacity: the volume of air breathed out after the deepest inhalation. V T Tidal volume: that volume of air moved into or out of the lungs during quiet breathing (VT indicates a subdivision of the lung; when tidal volume is precisely measured, as in gas exchange calculation, the symbol TV or V T is used.)
The FEV1/FVC ratio, also called modified Tiffeneau-Pinelli index, [1] is a calculated ratio used in the diagnosis of obstructive and restrictive lung disease. [2] [3] It represents the proportion of a person's vital capacity that they are able to expire in the first second of forced expiration to the full, forced vital capacity (). [4]