Maximal voluntary ventilation: volume of air expired in a specified period during repetitive maximal effort Peak expiratory flow: The highest forced expiratory flow measured with a peak flow meter Unless otherwise specified, volume qualifiers indicate the volume inspired from RV at the point of measurement.) For example, maximum inspiratory flow is denoted FIF max. The maximum instantaneous flow achieved during a FVC maneuverįorced inspiratory flow: (Specific measurement of the forced inspiratory curve is denoted by nomenclature analogous to that for the forced expiratory curve. Volume that has been exhaled at the end of the first second of forced expirationįorced expiratory flow related to some portion of the FVC curve modifiers refer to amount of FVC already exhaled Residual volume expressed as percent of TLCĪctual volume of the lung including the volume of the conducting airway.įorced vital capacity: the determination of the vital capacity from a maximally forced expiratory effortįorced expiratory volume (time): a generic term indicating the volume of air exhaled under forced conditions in the first t seconds 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.)įunctional residual capacity: the volume in the lungs at the end-expiratory position Vital capacity: the volume of air breathed out after the deepest inhalation. Inspiratory vital capacity: the maximum volume of air inhaled from the point of maximum expiration Inspiratory capacity: the sum of IRV and TV Inspiratory reserve volume: the maximal volume that can be inhaled from the end-inspiratory level Residual volume: the volume of air remaining in the lungs after a maximal exhalationĮxpiratory reserve volume: the maximal volume of air that can be exhaled from the end-expiratory position Tidal volume: that volume of air moved into or out of the lungs during quiet breathing (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.) Total lung capacity: the volume in the lungs at maximal inflation, the sum of VC and RV.

Dead space ventilation equation