Which of the following volumes or capacities cannot be measured by simple spirometry?
I. functional residual capacity (FRC)
II. expiratory reserve volume (ERV)
III. residual volume (RV)
IV. inspiratory reserve volume (IRV)

Question

Which of the following volumes or capacities cannot be measured by simple spirometry?
I.	functional residual capacity (FRC)
II.	expiratory reserve volume (ERV)
III.	residual volume (RV)
IV.	inspiratory reserve volume (IRV)

Quizplus · Accepted Answer

Functional residual capacity (FRC) and residual volume (RV) cannot be measured by simple spirometry because they are the volumes of air remaining in the lungs after a maximal expiration. This requires additional measurements such as helium dilution or body plethysmography. Expiratory reserve volume (ERV) and inspiratory reserve volume (IRV) can be measured by simple spirometry.

Which of the Following Volumes or Capacities Cannot Be Measured