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A thyroid uptake and scan is a test that uses a radioactive substance and a scanning tool to evaluate the thyroid gland. The scanner picks up where and how much the radioactive substance was taken up by the thyroid. This helps determine the structure, location, size, and activity of the gland.
You may be asked to avoid certain food (containing iodine) or thyroid medicine before the scan. Some can interfere with the results.
Jewelry, dentures, and other metallic objects will be removed.
You may be asked not to eat or drink anything after midnight.
Your doctor may order some tests to measure the amount of thyroid hormone in your blood.
Description of Test
The procedure is done by a trained technician in the radiology department of a hospital. You will be given a radioactive substance by mouth. Once the substance has had time to collect in the thyroid, the scan begins. You will lie on your back with your head tilted back. You will be asked to lie very still at certain times. A scanner will take pictures of your thyroid from different angles. The camera is not an x-ray machine. It does not expose you to more radiation. You may need to return to the radiology department after 24 hours for additional pictures.
Because of the very low dose of radioactive substance used, the majority of the radioactive substance will leave your body within a day or two. You are not at risk for exposing other people to radiation. You can interact normally with them.
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