A biologic control subject has an established FVC of 5.00 L with an SD of 0.20 L.After spirometer maintenance,the following values are obtained from the biologic control: On the basis of these findings,the pulmonary function technologist should conclude what?
A) Spirometer performance is within acceptable statistical limits.
B) Spirometer performance is questionable.
C) The control subject's efforts were greater than normal.
D) The control subject's efforts were not temperature-corrected to BTPS.

Question

A biologic control subject has an established FVC of 5.00 L with an SD of 0.20 L.After spirometer maintenance,the following values are obtained from the biologic control:  On the basis of these findings,the pulmonary function technologist should conclude what?
A) Spirometer performance is within acceptable statistical limits. 
B) Spirometer performance is questionable. 
C) The control subject's efforts were greater than normal. 
D) The control subject's efforts were not temperature-corrected to BTPS.

Quizplus · Accepted Answer

The obtained FVC value of 4.20 L is significantly lower than the established mean FVC of 5.00 L with a difference of 0.80 L. This difference is greater than two standard deviations (2 x 0.20 L = 0.40 L) from the mean, indicating that spirometer performance may be questionable.

A Biologic Control Subject Has an Established FVC of 5