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What does MEF75% stand for?

MEF75% stands for maximal expiratory flow at 25% , 50% and 75

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maximal midexpiratory flow FEF25–75; the maximum rate of airflow measured between expired volumes of 25 and 75 per cent of the vital capacity during a forced expiration; represented graphically as the slope of the line connecting the points on the forced expiratory volume curve at 25 and 75 per cent of the forced vital capacity. See also pulmonary function tests. Called also maximal midexpiratory flow rate.
05 kPa/[L/s] at 10 L/s), with the highest FEV1 recorded in line with pulmonary guidelines. Spirometry was measured according to the recommendations of the American Thoracic Society/European Respiratory Society task force guidelines. 15 FEV1, FVC, FEV1%, peak expiratory flow (PEF), and maximal expiratory flow (MEF) at 25%, 50%, and 75% of vital capacity were measured. Each maneuver was repeated for at least three technically acceptable forced expiratory flow curves.