(Thyroid Scintiscan; Technetium Thyroid Scan)
Reasons for Test
- Determine the cause of an overactive thyroid ( hyperthyroidism )
- Test how well the thyroid is working
- Determine if a thyroid nodule is functioning (if it is making thyroid hormone)
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- Have an allergy to medication or food (including iodine or shellfish )
- Are (or might be) pregnant or breastfeeding—the test could expose the baby to radiation
- Take any medications on a regular basis—some can interfere with test results
- If you recently had any CAT scans , cardiac catheterizations , or other imaging tests that use contrast dye
What to Expect
Prior to Test
- You may be asked to avoid certain food (containing iodine) or thyroid medication before the scan. Some can interfere with the results.
- Jewelry, dentures, and other metallic objects will be removed.
- You may be asked not to eat or drink anything after midnight.
- Your doctor may order some tests to measure the amount of thyroid hormone in your blood.
Description of Test
How Long Will It Take?
Will It Hurt?
Call Your Doctor
American Thyroid Association, Inc. http://www.thyroid.org
Hormone Health Network http://www.hormone.org
Public Health Agency of Canada http://www.phac-aspc.gc.ca
The Thyroid Foundation of Canada http://www.thyroid.ca
Hyperthyroidism and Graves' disease. Johns Hopkins University website. Available at: http://www.hopkinsmedicine.org/endocrine/graves/Answer.asp%3FQuestionID%3D14. Accessed December 16, 2014.
Thyroid scan. Harvard Medical School Family Health Guide website. Available at: http://www.health.harvard.edu/diagnostic-tests/thyroid-scan.htm. Accessed August 2005.
Thyroid nodule. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated November 23, 2014. Accessed December 16, 2014.
Thyroid nodules. American Thyroid Association website. Available at: http://www.thyroid.org/what-are-thyroid-nodules. Accessed December 16, 2014.
Thyroid scan and uptake. RadiologyInfo.org website. Available at: http://www.radiologyinfo.org/en/info.cfm?pg=thyroiduptake. Updated March 28, 2013. Accessed December 16, 2014.
- Reviewer: Kim A. Carmichael, MD, FACP
- Review Date: 12/2014 -
- Update Date: 12/20/2014 -