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Radioactive Iodine Uptake Test

(continued)

What Affects the Test

Reasons you may not be able to have the test or why the results may not be helpful include:

Taking thyroid medicine.
Eating foods with iodine, such as shellfish, iodized salt, or kelp.
Having other tests using contrast materials in the past 4 weeks.

What To Think About

Blood tests may be done before a radioactive iodine uptake (RAIU) to measure the amount of thyroid hormones (TSH, T3, and T4) in your blood. For more information, see the topics Thyroid-Stimulating Hormone (TSH) and Thyroid Hormone Tests.
A thyroid scan may be done at the same time as an RAIU test. For more information, see the topic Thyroid Scan.

Other Works Consulted
Fischbach FT, Dunning MB III, eds. (2009). Manual of Laboratory and Diagnostic Tests, 8th ed. Philadelphia: Lippincott Williams and Wilkins.

By	Healthwise Staff
Primary Medical Reviewer	E. Gregory Thompson, MD - Internal Medicine
Specialist Medical Reviewer	Matthew I. Kim, MD - Endocrinology
Last Revised	May 31, 2011

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WebMD Medical Reference from Healthwise

Last Updated: May 31, 2011

This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.