A patient with suspected asthma is scheduled for a challenge test. What result would confirm the diagnosis?
A) Exhalation of low amounts of nitrogen oxide
B) Exhalation of high amounts of nitrogen oxide
C) Exhalation of low amounts of carbon dioxide
D) Exhalation of high amounts of carbon dioxide
B) Exhalation of high amounts of nitrogen oxide
Explanation: A) The classic confirmatory test for asthma is a challenge test. During this test, the individual breathes dilute amounts of an irritating substance, such as methacholine or very cold air, to provoke airway obstruction and asthma symptoms. Asthmatics exhale higher levels of nitrogen oxide than do control subjects matched by age, gender, and lung function, and levels are higher when asthma is not in good control.
B) The classic confirmatory test for asthma is a challenge test. During this test, the individual breathes dilute amounts of an irritating substance, such as methacholine or very cold air, to provoke airway obstruction and asthma symptoms. Asthmatics exhale higher levels of nitrogen oxide than do control subjects matched by age, gender, and lung function, and levels are higher when asthma is not in good control.
C) The classic confirmatory test for asthma is a challenge test. During this test, the individual breathes dilute amounts of an irritating substance, such as methacholine or very cold air, to provoke airway obstruction and asthma symptoms. Asthmatics exhale higher levels of nitrogen oxide than do control subjects matched by age, gender, and lung function, and levels are higher when asthma is not in good control.
D) The classic confirmatory test for asthma is a challenge test. During this test, the individual breathes dilute amounts of an irritating substance, such as methacholine or very cold air, to provoke airway obstruction and asthma symptoms. Asthmatics exhale higher levels of nitrogen oxide than do control subjects matched by age, gender, and lung function, and levels are higher when asthma is not in good control.
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