A Maximum expiratory flow (Vmax x) is Forced expiratory flow, related to the total lung capacity or the actual volume of the lung at which the measurement is made. Modifiers refer to the amount of lung volume remaining when the measurement is made. For example:

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Flow volume curve ■■■■■■■
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Expiratory ■■■■■■
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Functional residual capacity ■■■■■■
A Functional residual capacity (FRC) is the sum of RV and ERV (the volume of air remaining in the lungs . . . Read More
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A Maximum breathing capacity (MBC) is Maximal volume of air that can be breathed per minute by a subject . . . Read More
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Forced expiratory volume (FEV) ■■■■
A Forced expiratory volume (FEV) is Denotes the volume of gas that is exhaled in a given time interval . . . Read More