The computer grades are QFVC=D, QFEV1=A. The computer FVC grade is low as none of the curves have a plateau in the volume-time curve. Curve #4 (red) is rejected because of a large extrapolated volume. The FEV1 grade is lowered from the computer determined A to a B as there are only two acceptable curves with respect to FEV1. The FVC grade is increase to a B as the rejected curve (red) has a plateau and is only 94 ml larger than Curve #2 (green) that does not have a plateau. Thus the FVC can be considered repeatable, based on the rejected curve, and the grades are QFVC=B and QFEV1=B.
