What does increased uptake mean on thyroid scan?

What does increased uptake mean on thyroid scan?

A high uptake of tracer spread evenly in the thyroid gland may mean that hyperthyroidism is caused by conditions such as Graves’ disease.

What is pertechnetate thyroid scan?

Technetium 99m pertechnetate (99mTcO4−) is a useful radioactive label for thyroid scanning. It is of particular merit when emphasis is placed upon a low dose of thyroid radiation, optimal resolution, and scanning of thyroid glands in which function is decreased or partly blocked.

What is the difference between thyroid scan and uptake?

The thyroid scan is used to determine the size, shape and position of the thyroid gland. The thyroid uptake is performed to evaluate the function of the gland. A whole-body thyroid scan is typically performed on people who have or had thyroid cancer.

What is the normal 24 hour radioactive iodine uptake?

The normal values of thyroid uptake of radiotracer are 3 to 16% at 6 hours and 8 to 25% at 24 hours. These values may change according to laboratory standard techniques or patient dietary habits. The thyroid gland can uptake more or less than normal.

Why do I need a thyroid uptake scan?

A thyroid uptake and scan is a diagnostic imaging scan that allows the radiologist to determine the function of the thyroid. This scan can determine if the patient has thyroid cancer: persistent or recurrent disease, hyperthyroidism and thyroid nodule or goiter assessment.

What does increased uptake mean?

Increased tracer uptake corresponds to revascularization phase. The common causes of bone infarct are prolonged corticosteroid use, sickle cell disease, trauma, Gaucher’s disease, and renal transplantation.[2]

How is pertechnetate produced?

Pertechnetate salts are usually colorless. [TcO4]− is produced by oxidizing technetium with nitric acid or with hydrogen peroxide. The pertechnetate anion is similar to the permanganate anion but is a weaker oxidizing agent. It is tetrahedral and diamagnetic.

Is a thyroid uptake scan safe?

The risk is minimal. The amount of radioactivity is very small and there have been no documented side effects. However, as with any radiation exposure, this test is not recommended for women who are pregnant or breastfeeding. The amount of iodine used is less than a normal dietary iodine intake.

What is thyroid uptake scan and side effects?

Thyroid scans and uptake tests do not generally cause any after effects. Through the natural process of radioactive decay, the small amount of radioactive chemical in your body will lose its radioactivity over time.

How long are you radioactive after a thyroid uptake scan?

After a time (usually 6 and 24 hours later), you must return to have the radioactivity measured. A gamma probe is placed over the thyroid gland in the neck to measure the amount of radioactivity in the thyroid gland.

How long does it take to get results from a thyroid scan?

This test is quick, accurate, cheap, painless, and completely safe. It usually takes only about 10 minutes and the results can be known almost immediately.

What does the word uptake mean in medical terms?

Medical Definition of uptake : an act or instance of absorbing or incorporating something especially into a living organism, tissue, or cell In muscle and adipose tissue, insulin stimulates the uptake, storage, and use of glucose.—

What is a nuclear medicine thyroid uptake and scan?

Thyroid Uptake and Scan Images of your thyroid are then A nuclear medicine thyroid uptake and scan is a 2-day test that studies the structure and function of the thyroid gland. Read this handout to learn how to prepare for the test, how it works, how it is done, what you may feel during the test, and how to get your results.

Is 99mTc-pertechnetate better than 131i-iodide for thyroid imaging?

Context: Thyroid uptake and scintigraphy using 99mTc-pertechnetate has proven to be more advantageous than with 131I-iodide, since the images have better quality, the procedure is faster and the patient is submitted to a lower radiation dose.

What is an I-123 uptake and scan?

Thyroid Uptake and Scan Special Instructions This examination can be performed with I-123 uptake and scan an (generally preferred) versus I-131 uptake followed by an Tc-99m a pertechnetate scan. Patients who have previously had an uptake and scan may have a 24hour I- -131 uptake only(without scan) prior to therapy.

What is Atkins’ technetium-99m pertechnetate?

Atkins HL. Technetium-99m pertechnetate uptake and scanning in the evaluation of thyroid function. Semin Nucl Med. 1971 Jul;1(3):345-55.