What is pertechnetate thyroid scan?
Tc-99m pertechnetate thyroid scintigraphy (thyroid scan) is a functional nuclear medicine study used to assess the thyroid gland. The uptake of the pertechnetate anion – similar in chemical-physical characteristics to the iodide ion – in the thyroid parenchyma is mediated by the NIS (sodium-iodide symporter).
What is a normal thyroid uptake percentage?
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.
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 pertechnetate used for?
Pertechnetate scintigraphy is used for detecting asymmetry of the thyroids, for localizing of active thyroid nodules and “hot spots” (Scriviani et al., 2007).
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 happens during a thyroid uptake scan?
During Your Exam On your first visit, you will swallow a small radioactive iodine capsule. On your second visit (four hours after taking the capsule), you will have an uptake measurement, pictures of your thyroid gland and an examination of your thyroid gland by the nuclear medicine physician.
Why would a doctor order a thyroid uptake scan?
What can I expect from a thyroid uptake scan?
What is the meaning of pertechnetate?
Medical Definition of pertechnetate : an anion [TcO4]− of technetium used especially in the form of its sodium salt as a radiopharmaceutical in medical diagnostic scanning (as of the thyroid or brain)
What is Tc 99m 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.
How long are you radioactive after a thyroid uptake scan?
However, the amount of radioactivity is minute, so special precautions may or may not be advised for 24 to 48 hours (often this simply includes flushing twice after urinating). Consult the health care provider or the radiology/nuclear medicine department performing the scan.
What is Tc-99m pertechnetate used for?
Tc-99m pertechnetate has been used since 1970 to diagnose heterotopic gastric mucosa. The most common clinical indication has been to detect a Meckel’s diverticulum as the cause of gastrointestinal bleeding in a child. However, it can be used to diagnose and localize other types of heterotopic gastric mucosa listed previously.
What is pertechnetate anion?
The pertechnetate anion is, among the chemical species of technetium, the most stable in aqueous solution 6,7 . Pediatric doses have been derived from various sources, a true international consensus remains work in progress. Technetium was discovered in 1937 by C. Perrier and Emilio Segre at Palermo University.
How is a 99m Tc-pertechnetate scan distinguished from a 123 I scan?
On a 99m Tc-pertechnetate scan, the salivary glands are usually well seen in addition to the thyroid. As a result, unless a patient has increased thyroid uptake of 99m Tc-pertechnetate as in diffuse toxic goiter (Graves disease), the scan can usually be distinguished from an 123 I scan by excellent visualization of the salivary glands.
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.
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