Is it possible for a Subject to have a vital capacity single stage within normal range but a value for FEV1 below normal range?

Answer 1

'''''11/23/2010: according to the Biopac Lab Experiment B12 PULMONARY FUNCTION TESTS: FORCED EXPIRATORY VOLUME AND MAXIMAL VOLUNTARY VENTILAITON,''' the following would be the reason for this: "In restrictive pulmonary diseases, FEV is reduced. A person with Asthma may have a normal range or near-normal vital capacity as measured in a simple one-stage test in which the subject can take as long as necessary to maximally inhale and exhale; however, when an asthmatic exhales vital capacity with maximal effort, FEV measurements are all reduced because heavy mucus secretion reduceds airway diamerter and it takes longer to completely exhale vital capacity against increased airway resistance."''

''The following person answered "obstructive disease" is not the correct answer. -dv''

Well, i think that it is possible.

This is because the person could, e.g., have an obstructive disease. In this case, the vital capacity could be normal while the FEV1 is reduced. The FEV1 would be below normal range because, in the one second, less air is expired as the resistance to air flow is increased.

... i dunno thaz jus my opinion, I'm struggling to answer it too!!!! I hope you understand what I'm tryinto say.