acceptable spirogram should not be discarded even if it cannot be reproduced. Perhaps 2
more spirograms can be gotten on another day. Up to 8 efforts may be performed at one time
in order to meet acceptability and reproducibility criteria. Beyond 8 efforts, fatigue may
play a role in the results, and additional efforts are not warranted. When reporting the
actual values obtained from spirometry, the highest FEV1 and FVC should be reported and
may be from different efforts. By contrast, FEF 25-75, flow volume, and volume time curves
should be reported from the best test curve. This is defined as the
acceptable curve with the largest sum of FVC and FEV1.