Radioactive Iodine Uptake Scan: A Crucial Diagnostic Tool for Thyroid Disorders

The radioactive iodine uptake (RAIU) scan is a valuable diagnostic test used to assess thyroid function and identify disorders such as hyperthyroidism and thyroid nodules.

Indications

• Evaluation of hyperthyroidism
• Diagnosis of Graves’ disease
• Assessment of thyroid nodules
• Pre-treatment assessment before radioiodine therapy

Procedure

The RAIU scan involves oral administration of radioactive iodine, followed by measurement of iodine uptake by the thyroid gland using a gamma camera.

Interpretation

Increased uptake may indicate Graves’ disease, toxic multinodular goiter, or autonomous thyroid nodules. Reduced uptake may suggest thyroiditis or iodine deficiency.

Role in Diagnosing Thyroid Disorders

The RAIU scan provides critical insights into thyroid activity and helps clinicians formulate an appropriate management plan.