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A radioactive iodine uptake (RAIU) is one of two kinds of scans used to diagnose thyroid diseases. It shows how well your thyroid is functioning.
For thyroid tests, radioactive iodine is typically used. Your thyroid and most types of thyroid cancer absorb iodine naturally.
An antithyroid microsomal antibody test is also called a thyroid peroxidase test. It measures antithyroid microsomal antibodies in your blood.