[MEF test--an instrument for the determination of maximal expiratory flow values PEF, MEF 75, MEF 50, MEF 25].

For reduction the working extent in measurement and classification of flow-volume curves a device was developed which calculates and indicates digitally the maximal expiratory flow values PEF, MEF 75, MEF 50 and MEF 25 directly from the flow in forced expiration. We have used an approaching calculation method whereby the expense of realization was low. By a comparative examination of 172 patients, it could be found that the device has a sufficient measuring accuracy and is advantageously applicable to clinics and screening.