Management Team

Radio-iodine whole body scan (I-131)

Overview

A Radioiodine whole-body scan is performed for patients with thyroid cancer to assess the state post-surgery.

The procedure involves taking a small amount of radioactive iodine, which is absorbed by the thyroid gland. A gamma camera then takes images to assess how your thyroid absorbs iodine and how it functions.

Doctors recommend a radioiodine scan to:

  • Evaluate thyroid cancer after surgery or treatment
  • Plan dosage of therapeutic radioiodine

  • Dietary Restrictions: You will be asked to follow a low-iodine diet 1-2 weeks before the scan.
  • Medications: Few medications need to be stopped before the scan. Please contact the Nuclear Medicine department or your doctor.
  • Pregnancy and breastfeeding: Inform your doctor if you suspect you may be or are pregnant or breastfeeding. This scan is generally not recommended during pregnancy or breastfeeding.

  1. Radioiodine administration: You will be given a small dose of radioactive iodine, either in the form of a pill or a liquid. This iodine will be absorbed by your thyroid gland over several hours.
  2. Waiting period: After taking the iodine, you will then have to return the next or day after for the scan depending on what information you doctor needs.
  3. Scan: You will be asked to lie down on a table, and a special camera will capture images of your thyroid gland. The scan is painless and takes around 30 to 60 minutes.

  • You can usually return to your normal activities right after the scan.
  • The radioactive iodine will pass naturally through your body, usually within a few days.
  • Drink plenty of water to help flush out the iodine.
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