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, ...

Eun Lee, MD Key Takeaways Iodine is important for thyroid hormone production. Pregnant people need more iodine than others. Iodine is found in fish, seaweed, dairy, and iodized salt. Iodine deficiency ...

The thyroid is a butterfly-shaped gland that sits in the front of the neck. It produces hormones that are essential for heart rate, digestion, mood, and other functions crucial to human health.

If a person wants to carry out a thyroid test, they may consider one of the following from these popular companies. None of these companies state that the Food and Drug Administration (FDA) approves ...