In the radioactive iodine uptake (RAIU) test, you swallow a small amount of radioactive iodine before you receive a scan. The test reveals how well your thyroid is functioning. The thyroid is a gland ...

A radioactive iodine uptake (RAIU) tests the function of your thyroid gland, which helps regulate your metabolism. It works by measuring how much radioactive iodine is absorbed by the thyroid gland, ...

Milakovic, M., Berg, G., Eggertsen, R. et al. Effect of lifelong iodine supplementation on thyroid 131-I uptake: a decrease in uptake in euthyroid but not hyperthyroid individuals compared to ...