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Lung Perfusion Study - Pulmonary Perfusion Scan
Overview & Description
A pulmonary perfusion scan looks at the blood flow to the lung tissue. 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 perfusion scan in the following circumstances:
How is the test performed?
For the scan, a person is often asked to sit upright. If a person is unable to sit, he or she can lie flat on a table. A radioactive substance known as Tc-99m macroaggregated albumin will be injected into a vein in the arm. The substance gives off gamma rays from within the body. These rays are detected by a "gamma camera" that is positioned over the chest.
A computer then generates pictures that can be interpreted by a radiologist. The lungs will be scanned in multiple positions (usually six). The exam takes approximately 45 minutes. Usually, a second test called a pulmonary ventilation scan will follow the 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 blood flow to the lung is normal. An abnormal test result often indicates a problem with blood flow to the lungs caused by a pulmonary embolus.
Attribution
Author:James Compton, MD
Date Written:
Editor:Crist, Gayle P., MS, BA
Edit Date:05/21/01
Reviewer:Adam Brochert, MD
Date Reviewed:05/22/01