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.

A physician may perform these imaging tests to:

  • determine if the gland is working properly
  • help diagnose problems with the thyroid gland, such as an overactive thyroid gland, a condition called hyperthyroidism, cancer or other growths
  • assess the nature of a nodule discovered in the gland
  • detect areas of abnormality, such as lumps (nodules) or inflammation
  • determine whether thyroid cancer has spread beyond the thyroid gland
  • evaluate changes in the gland following medication use, surgery, radiotherapy or chemotherapy