Scan, thyroid: An image taken of the thyroid gland after radioactive iodine is taken by mouth. The thyroid gland is in front of the neck:
Thyroid scanning is a nuclear medicine procedure. As the thyroid gland accumulates radioactive material (usually, radioactive technetium or iodine), the gland produces an image.
Thyroid scanning is used to determine how active the thyroid is in manufacturing thyroid hormone. This can determine whether inflammation of the thyroid gland (thyroiditis) is present. It can also detect the presence and degree of overactivity of the gland (hyperthyroidism) or, conversely, it can determine the presence and degree of underactivity of the gland (hypothyroidism).
Thyroid scanning is helpful in evaluating thyroid nodules, particularly after a fine needle aspiration biopsy of a nodule has failed to provide a definitive diagnosis. A scan will reveal whether a thyroid nodule is functioning or nonfunctioning. A functioning nodule actively takes up iodine to produce thyroid hormone and produces a localized "hot" area on the image of the thyroid gland. A nonfunctioning nodule does not take up iodine and so produces a "cold" area on the image of the thyroid gland. Functioning or "hot" nodules only rarely are from cancer. Nearly all thyroid cancers are nonfunctioning or "cold" nodules. Moreover, even among "cold" nodules, cancer is infrequent (less than 5 percent of cases).
Learn about a thyroid scan, a procedure to assist in diagnosing, hypothyroidism, thyroiditis, hyperthyroidism, thyroid nodules, and thyroid cancer.
A thyroid scan uses a radioactive tracer and a special camera to measure how much tracer the thyroid gland absorbs from the blood. A thyroid scan is done ...
Current and accurate information for patients about Thyroid Scan and Uptake. Learn what you might experience, how to prepare for the exam, benefits, risks and more.
A thyroid scan is a nuclear medicine examination that uses a radioactive iodine tracer to see how well the thyroid gland is working. How the Test is ...
Thyroid scan Definition A thyroid scan is a nuclear medicine examination that uses a radioactive iodine tracer to see how well the thyroid gland is working.