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Radioactive Iodine Uptake ScanAka: Radioiodine Uptake, Thyroid Iodine Uptake, RAIU

Indications
1. Hyperthyroidism
Diffusely Low radioidoine uptake with hyperthyrodism
1. Medications and other intakes
  1. Exogenous Thyroid intake
  2. Excessive exogenous iodine
  3. Amiodarone
2. Transient Thyroiditis
  1. Subacute Thyroiditis
  2. Postpartum Thyroiditis (5-8% Incidence)
  3. Painless lymphocytic Thyroiditis
Focal low RAIU (cold Nodule) with Hypothyroidism
1. Requires biopsy for Thyroid Cancer evaluation
High Radioiodine uptake with Hyperthyroidism
1. Diffusely increased uptake
  1. Thyrotoxicosis (e.g. Grave's Disease)
2. Localized increased uptake (Hot Nodule)
  1. Hyperfuntioning Thyroid Nodule

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This page was written by Scott Moses, MD. This page was last revised before 5/10/08, prior to consistent tracking of revision date. This page was last published on 6/1/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 6.0.