What does an iodine uptake scan show?

What does an iodine uptake scan show?

A radioactive iodine uptake (RAIU) test uses a radioactive tracer and a special probe to measure how much tracer the thyroid gland absorbs from the blood. The test can show how much tracer is absorbed by the thyroid gland.

What is indicated by I131 uptake?

I-131 whole body scan counts on the fact that thyroid tissue has a high affinity to uptake and trap the Iodine, which is performed by NIS. Some extra-thyroidal tissues like stomach, salivary glands, breast (especially if lactating), and urinary tract also express NIS and show physiologic uptake.

What does high iodine uptake mean?

Higher-than-normal uptake may be due to an overactive thyroid gland. The most common cause is Graves disease. Other conditions can cause some areas of higher-than-normal uptake in the thyroid gland. These include: An enlarged thyroid gland that contains nodules producing too much thyroid hormone (toxic nodular goiter)

What type of cancer is associated with iodine 131 exposure?

Exposure to I-131 can increase the risk of thyroid cancer. It is thought that risk is higher for people who have had multiple exposures and for people exposed at a younger age. But even among people who have documented exposures to I-131, few develop this cancer.

What blood test is for thyroid?

Thyroid function test A blood test measuring your hormone levels is the only accurate way to find out whether there’s a problem. The test, called a thyroid function test, looks at levels of thyroid-stimulating hormone (TSH) and thyroxine (T4) in the blood. Doctors may refer to this as “free” T4 (FT4).

What does iodine 131 do to the body?

I-131 is a radioactive iodine salt that alters the mechanism of iodine absorption in the thyroid gland. Its use is particularly useful in the destruction of cells in the thyroid gland that are overactive. It can also be used in diagnostic imaging techniques used for pheochromocytoma and neuroblastoma.