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Radioactive Iodine Uptake Test

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.

ByHealthwise Staff
Primary Medical ReviewerE. Gregory Thompson, MD - Internal Medicine
Specialist Medical ReviewerMatthew I. Kim, MD - Endocrinology
Last RevisedMay 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.

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