forced expiratory flow

forced expiratory flow
(FEF) the rate of airflow recorded in measurements of forced vital capacity, usually calculated as an average flow over a given portion of the expiratory curve; the portion between 25 and 75 per cent of forced vital capacity is called the maximal or maximum midexpiratory f.

Medical dictionary. 2011.

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  • forced expiratory volume — the fraction of the forced vital capacity that is exhaled in a specific number of seconds; abbreviated FEV, with a subscript telling how many seconds the measurement lasted. See also forced expiratory flow, under flow …   Medical dictionary

  • maximum expiratory flow — the rate of airflow during a forced vital capacity maneuver, often specified at a given volume; see also forced expiratory f. Called also maximal expiratory f …   Medical dictionary

  • peak expiratory flow — (PEF) the greatest rate of airflow that can be achieved during forced exhalation, beginning with the lungs fully inflated. Called also peak expiratory flow rate …   Medical dictionary

  • flow — 1. To bleed from the uterus less profusely than in flooding. 2. The menstrual discharge. 3. Movement of a liquid or gas; specifically, the volume of liquid or gas passing a given point per unit of …   Medical dictionary

  • maximal expiratory flow–volume curve — a curve generated during forced exhalation from total lung capacity to residual volume by plotting maximal expiratory flow against the corresponding lung volumes; it can also be constructed from a series of isovolume pressure flow curves at… …   Medical dictionary

  • peak flow meter — pēk flō n a device that measures the maximum rate of air flow out of the lungs during forced expiration and that is used esp. for monitoring lung capacity of individuals with asthma (as to indicate bronchial narrowing) called also peak expiratory …   Medical dictionary

  • maximum midexpiratory flow — the average rate of airflow measured between exhaled volumes of 25 and 75 per cent of the vital capacity during a forced exhalation. See also forced expiratory f. Called also maximal midexpiratory f. and maximal or maximum midexpiratory flow rate …   Medical dictionary

  • FEF — • forced expiratory flow …   Dictionary of medical acronyms & abbreviations

  • FEF25-75 — forced expiratory flow at 25 75% of forced vital capacity …   Medical dictionary

  • FEF50 — forced expiratory flow at 50% of forced vital capacity …   Medical dictionary

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