A patient is having a test to measure airflow speed during maximal exhalation through the mouth. Which test does the nurse explain to the patient?
A) Spirometry
B) Body plethysmography
C) Nitrogen washout
D) Incentive spirometry
A) Spirometry
Explanation: A) Spirometry, which measures airflow through the mouth when nasal airflow is obstructed, is used to measure the volume and speed of airflow during a maximal inhalation or maximal exhalation.
B) Body plethysmography measures the total volume of air in the lungs or total lung capacity (TLC).
C) Nitrogen washout is an alternative method that is used to estimate TLC when body plethysmography is not available.
D) Incentive spirometry is the use of a device to encourage maximal inhalation to prevent lung atelectasis. It is not a pulmonary function test.
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