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Lung Ventilation Study - Pulmonary Ventilation Scan
Overview & Description
A pulmonary ventilation scan shows the distribution of the air a person breathes into the lung. It is used most often to diagnose a blood clot in the lung, known as a pulmonary embolus.
Who is a candidate for the test?
The healthcare provider may order a pulmonary ventilation scan in the following circumstances:
How is the test performed?
For the pulmonary ventilation scan, the person is usually asked to sit upright. If the person is unable to sit, he or she can lie flat on his or her back on a table. Before the scan begins, the technologist will rehearse special breathing maneuvers with the individual. The person is asked to breathe in a radioactive gas, such as xenon-133 or krypton-81. The person will breathe the gas in and out through either a tight-fitting mask or a mouthpiece with a nose clamp. The gas gives off gamma rays, which can be detected by a "gamma camera" that is positioned over the chest. A computer then generates pictures that can be interpreted by a radiologist.
A pulmonary ventilation scan is performed on a person who is suspected of having blood clots in the lungs or other breathing difficulties. This test is normally done together with a pulmonary perfusion scan.
Preparation & Expectations
What is involved in preparation for the test?
The individual will undress from the waist up and put on an exam gown. All jewelry and metal objects will be removed.
Results and Values
What do the test results mean?
A normal test shows that the air distribution in the lung is normal. An abnormal test can indicate disorders, including the following:
Attribution
Author:James Compton, MD
Date Written:
Editor:Crist, Gayle P., MS, BA
Edit Date:06/30/01
Reviewer:Adam Brochert, MD
Date Reviewed:05/22/01