What is the minimum objective standard for the volume exhaled during the final 1 sec of an ac-ceptable forced vital capacity effort?

a. 0.10 L
b. 0.05 L
c. 0.025 L
d. 0.001 L

ANS: C
An end-expiratory plateau must be obvious in the volume-time curve; the objective standard is less than 0.025 L exhaled during the final second of exhalation.