Question

question 71
1 pts
a young adult patient develops a cough persisting longer than 2 months. the provider prescribes pulmonary function tests and a chest radiograph, which are normal. the patient denies abdominal complaints. there are no signs of rhinitis or sinusitis and the patient does not take any medications. what will the provider evaluate next to help determine the cause of this cough?
24 - hour esophageal ph monitoring
methacholine challenge test
sputum culture
tuberculosis testing

Explanation:

Since pulmonary function tests and chest radiograph are normal, ruling out structural and some pulmonary - based causes. Absence of abdominal symptoms rules out some gastrointestinal causes related to cough. No rhinitis or sinusitis rules out upper - airway cough syndrome. A methacholine challenge test is useful to detect airway hyper - responsiveness which can be a cause of chronic cough when other common causes are excluded.

Answer:

B. Methacholine challenge test