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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.
Highlights. 1  A pulmonary ventilation/perfusion scan consists of two scans that are performed one after the other. They measure air and blood flow in the lungs. 2  These scans are used to measure lung function for a variety of reasons, but are performed most often for a blood clot in the lungs, called a pulmonary embolus.