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Radioactive Iodine Uptake Scan

Aka: Radioactive Iodine Uptake Scan, 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

Family Practice Notebook

Patients should address specific medical concerns with their physicians.

Although access to this page is not restricted, the information found here is intended for use by medical providers.

This page was written by Scott Moses, MD, last revised on 10/21/2007 and last published on 2/5/2012.

This is one of 5663 pages in the Family Practice Notebook