Which of the following are characteristics of PEF?
I.It reflects large airway function.
II.PEF in normal adults may exceed 10 L/sec.
III.It is an effort-dependent test.
IV.PEF is useful in assessing gross changes in airway function and evaluating the response to bronchodilator drugs.

Question

Quizplus · Accepted Answer

The peak expiratory flow (PEF) reflects initial expiratory flow coming from the large airways at the beginning of the FVC. Thus, PEF reflects large airway function. It is an effort-dependent test: the greater the effort, the higher the test value. PEF in normal adults may exceed 10 L/sec. Reproducibility of the PEF is a good indication of maximal patient effort. The PEF is useful in assessing gross changes in airway function and evaluating the response to bronchodilator drugs. This test is very useful in managing asthma in outpatient and home settings.

Which of the Following Are Characteristics of PEF