Radioactive Iodine Uptake Test

Iodine Uptake Test, Radioactive

Why It Is Done

A radioactive iodine uptake (RAIU) test is done to:

• Find the cause of an overactive thyroid gland (hyperthyroidism).
• Plan treatment for hyperthyroidism or a thyroid lump (thyroid nodule).

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Author:	Caroline Rea, RN, BS, MS	Last Updated: August 14, 2008
Medical Review:	Caroline S. Rhoads, MD - Internal Medicine Matthew I. Kim, MD - Endocrinology & Metabolism
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