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To diagnose atelectasis, a doctor starts by recording the patient's symptoms and performing a thorough physical examination. When the doctor listens to the lungs through a stethoscope (ausculation), diminished or bronchial breath sounds may be heard. By tapping on the chest (percussion) while listening through the stethoscope, the doctor can often tell if the lung is collapsed. A chest x ray that shows an airless area in the lung confirms the diagnosis of atelectasis. If an obstruction of the airways is suspected, a computed tomography scan (CT) or bronchoscopy may be performed to locate the cause of the blockage.
— Jeffrey P. Larson, RPT
