Radioactive iodine uptake

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Radioactivity test

Iodine uptake test; RAIU

• 6 hours: 3 - 16%
• 24 hours: 8 - 25%

Note: Some laboratories only measure at 24 hours. Values may vary depending on the amount of iodine in your diet. Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

Increased levels may be due to:

• Hashimoto's thyroiditis (early)
• Hyperthyroidism
• Goiter

Decreased levels may be due to:

• Hypothyroidism
• Factitious hyperthyroidism
• Iodine overload
• Subacute thyroiditis

Additional conditions under which the test may be performed:

• Colloid nodular goiter
• Graves disease
• Painless (silent) thyroiditis
• Toxic nodular goiter

Review Date: 04/19/2010
Reviewed By: Ari S. Eckman, MD, Division of Endocrinology and Metabolism, Johns Hopkins School of Medicine, Baltimore, MD. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org).

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