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Parathyroid Sestamibi - About the Exam

The parathyroid sestamibi exam can detect parathyroid tumors in the body.

Sestamibi is a small protein which is labeled with the radio-pharmaceutical technetium-99. This very mild and safe radioactive agent is injected into the veins of a patient with parathyroid disease (hyperparathyroidism) and is absorbed by the overactive parathyroid gland. The parathyroid tumor will collect the radioactive dye. A sestamibi scan will show the bad parathyroid tumor and it will not show your normal parathyroid glands.

What you can expect during a parathyroid sestamibi exam:

  • You will be asked to lie on the examination table, where you will likely be positioned on your back.
  • A very mild and safe radioactive agent will be injected into your veins.
  • The table will start moving, first slowly and then relatively more rapidly when the actual CT is performed.
  • When the examination is completed, you will be asked to wait until the technologist verifies that the images are of high enough quality for accurate interpretation.
  • The CT examination is usually completed within 30 minutes.

Learn how to prepare for a parathyroid sestamibi exam.

Learn the benefits and risks of parathyroid sestamibi exam.