Radioactive Iodine Uptake Test

A Radioactive Iodine Uptake (RAIU) test measures how well your thyroid gland absorbs iodine, which it needs to produce thyroid hormones. During the test, a small amount of radioactive iodine is given orally or via injection. After a specified time, a special device measures how much iodine the thyroid has taken up. This helps doctors evaluate thyroid function and diagnose conditions like hyperthyroidism or hypothyroidism. The test is safe, with minimal radiation exposure, and provides valuable information about how well your thyroid is working.