What is the definition or description of: thyroid scan?

Thyroid function: The patient ingests radioactive iodine or has intravenous injection of radiotracer technetium to define structure, size, and function of thyroid gland. Overactive ( hyperthyroid) normal, and underactive thyroid glands are determined. Sometimes autoimmune conditions and tumors of the gland can be suspected. Correlative imaging ultrasound, mr imaging, and blood tests are used for confirmation.

Radiology test: A thyroid scan is a radiologic test that employs a radioactive tracer and measures uptake by the gland. The test demonstrates functioning of the thyroid as well as nodules which may be present within the gland. It is particularly useful in evaluating patients with hyperthyroidism. This test does not define anatomy well, nor does it have the ability to differentiate malignant from benign nodules.

Thyroid Nuclear Scan: Is a diagnostic procedure to evaluate the thyroid gland, which is located in the front of the neck and controls the body's metabolism. A radioactive substance that concentrates in the thyroid is taken orally usually. A special camera is used to take an image of the distribution of the radioactive substance in and around the thyroid. Evaluates thyroid function and diagnoses abnormalities.