 Radioactive iodine uptake test

The Radioactive Iodine Uptake (RAIU) test is a medical diagnostic procedure used primarily to evaluate thyroid gland function and diagnose various thyroid disorders, such as hyperthyroidism, hypothyroidism, and thyroid nodules. The test measures how much iodine the thyroid gland absorbs from a small dose of radioactive iodine administered to the patient.