Interpretation of Pulmonary Function Tests

Another value that is given with spirometry is the FEF25-75, or mid-flow rate. This is a measurement of what flow is like during the middle 1/2 of a forced breath. Although often said to be a measurement of small airways obstruction, the FEF25-75 is fairly non-specific and reductions can be seen with a number of non-obstructive diseases. ................
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