Which diagnostic procedure monitors a patient while sleeping to identify sleep apnea?
A) pulmonary function test
B) ventilation-perfusion scan
C) polysomnography
D) bronchoscopy
C
Explanation: Polysomnography is performed while a patient is sleeping to identify sleep apnea. The pulmonary function test gives information regarding air flow in and out of the lungs, lung volumes, and gas exchange between the lungs and bloodstream. Ventilation-perfusion scan is a nuclear medicine test useful in identifying pulmonary emboli. Bronchoscopy is done to visualize the inside of the bronchi.
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