NCBI Bookshelf. Bradley W. DeVrieze ; Al O. Authors Bradley W. DeVrieze 1 ; Al O. Peak expiratory flow measurement peak flow is a simple measure of the maximal flow rate that can be achieved during forceful expiration following full inspiration.
It is essential for PEF meters to have a linear response in order to obtain an unbiased measurement of PEF variability. As the accuracy and linearity of portable PEF meters have not been rigorously tested in recent years this aspect of their performance has been investigated. METHODS: The response of several portable PEF meters was tested with absolute standards of flow generated by a computer driven, servo controlled pump and their response was compared with that of a pneumotachograph. RESULTS: For each device tested the readings were highly repeatable to within the limits of accuracy with which the pointer position can be assessed by eye. This overreading was greatest for the Mini-Wright and Ferraris devices, and less so for the original Wright and Vitalograph meters.
Peak flow measurement is a quick test to measure air flowing out of the lungs. Peak flow measurement is mostly done by people who have asthma. Peak flow measurement can show the amount and rate of air that can be forcefully breathed out of the lungs.