Definition
A pulmonary ventilation scan involves one nuclear scan tests. The test use inhaled radioactive material (radioisotopes) to measure breathing (ventilation) in all areas of the lungs.

 

During the ventilation scan, you breathe in radioactive gas through a mask while you are sitting or lying on a table under the scanner arm.

 

How to prepare for the test
You do not need to stop eating (fast), eat a special diet, or take any medications before the test.

A chest x-ray is usually done before or after a ventilation scan.

You will sign a consent form and wear a hospital gown or comfortable clothing that does not have metal fasteners.

 

How the test will feel
The table may feel hard or cold.

The mask used during the ventilation scan may make you feel nervous about being in a small space (claustrophobia). You must lie still during the scan.

 

Why the test is performed
The ventilation scan is used to see how well air and blood flow moves through the lungs

A ventilation scan is most often done to detect a pulmonary embolus (blood clot in the lungs). It is also used to:

Detect abnormal circulation (shunts) in the blood vessels of the lungs (pulmonary vessels)

Test lung function in people with advanced pulmonary disease, such as COPD

 Special considerations
A pulmonary ventilation scan may be a lower-risk alternative to pulmonary angiography for evaluating disorders of the lung blood supply.

This test may not provide a definite diagnosis, especially in people with lung disease. Other tests may be needed to confirm or rule out the findings of a pulmonary ventilation scan