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Pulmonary ventilation/perfusion scan

Alternative Names: V/Q scan; Ventilation/perfusion scan; Lung ventilation/perfusion scan What the risks are: Risks are essentially the same as for x-rays (radiation) and needle pricks. Text Continues Below There is a small exposure to radiation from the radioisotope. The radioisotopes used during scans are short-lived, with almost all radiation leaving the body in a few days. However, as with any radiation exposure, caution is advised if you are a pregnant or breast-feeding woman. No radiation is emitted from the scanner. Instead, it detects radiation and converts it to a visible image. There is a slight risk for infection or bleeding at the site of the needle insertion. The risk with perfusion scan is no different than for placement of an intravenous needle for any other purpose. It is extremely rare, but a person may develop an allergy to the radioisotope, which may include a serious anaphylactic reaction. Special considerations: A pulmonary ventilation and perfusion scan may be a lower-risk alternative to pulmonary angiography for evaluating disorders of the lung blood supply. This test may not provide an absolute diagnosis, particularly in people with underlying lung disease. Other tests may be necessary to confirm or rule out the findings of a pulmonary ventilation and perfusion scan.

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