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

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Iodine is an important mineral found in nature, especially in oceans. Your body needs iodine to function properly. But it can't make it on its own. Instead, you need to get enough iodine through the ...