Gallium scan
Alternative Names: Liver gallium scan; Bony gallium scan
A gallium scan is a test that uses a radioactive material called gallium to look for swelling (inflammation), infection, or cancer in the body. It is a type of nuclear medicine exam.
See also: Gallium scan of the lung
Why is the Test Performed?
This test may be done to search for an unknown source of fevers. It is most often used for a cancer of the lymph system called lymphoma.
How is the Test Performed?
The technician will inject a radioactive material called gallium into a vein. The gallium travels through the bloodstream and collects in the bones and certain organs.
Your health care provider will tell you to return at a later time to be scanned. The scan will be taken 6 - 24 hours after the gallium is injected. The test time depends on what condition your doctor is looking for.
You will lie on your back on the scanner table. A special camera detects where the gallium has gathered in the body.
You must lie still during the scan, which takes 30 - 60 minutes.
Preparation for the Test
The night before the test, you may need a laxative to clean out the bowel so that stool does not interfere with the test. Or, you may get an enema 1 - 2 hours before the test.
Food and liquids are not restricted.
You must sign a consent form. Remove all jewelry and metal objects.
How will the Test Feel?
The injection will feel like a sharp prick. The site may be tender to the touch for a few minutes.
The hardest part of the scan is holding still. The scan itself is painless. The technician can help make you comfortable before the scan begins.
Gallium scan Risks
There is a small risk of radiation exposure (less than with x-rays or CT scans). Radiation exposure of any kind is not usually recommended for pregnant or nursing women or for young children unless it cannot be avoided.
Considerations
Not all cancers show up on a gallium scan.
Normal Results for Gallium scan
Gallium normally collects in bones, the liver, spleen, the large bowel, and breast tissue.
What Abnormal Results Mean
Gallium detected outside normal areas can be a sign of:
- Infection
- Inflammation
- Tumors, including Hodgkin's disease or non-Hodgkin's lymphoma
Lung conditions for which this test may be performed:
- Primary pulmonary hypertension
- Pulmonary embolus
- Respiratory infections, most often pneumocystitis jirovecii pneumonia
- Sarcoidosis
- Scleroderma of the lung
- Tumors in the lung
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Learn more about Gallium scan
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
Copyright 2011 A.D.A.M., Inc.
