How is collapsed lung diagnosed?

Your doctor will perform a physical examination of your lungs and ask whether you have a history of lung disease. An arterial blood gas test may be performed to measure the amount of carbon dioxide and oxygen in the blood. Higher than normal levels of carbon dioxide and low levels of oxygen are indicators of a collapsed lung. A chest X-ray will usually be obtained to confirm whether a pneumothorax is present. If the chest X-ray is inconclusive, computed tomography scan of the chest may be required.

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