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Two types of lung scans are usually done together: 1  Ventilation scan. During this scan, you inhale a radioactive tracer gas or mist. 2  Perfusion scan. During this scan, a radioactive tracer is injected into a vein in your arm.
1 Chest X-ray: An X-ray is the most common first test for lung problems. 2  It can identify air or fluid in the chest, fluid in the lung, pneumonia, masses, foreign bodies, and other problems. 3  Computed tomography (CT scan): A CT scan uses X-rays and a computer to make detailed pictures of the lungs and nearby structures.