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Radioactive Iodine Therapy

Radioactive Iodine is given in a capsule or liquid form, and then absorbed by the thyroid gland. The treatment destroys the harmful tissue in your thyroid gland, without affecting the other tissues in your body.

1.1 High Dose Radioactive Iodine (100-200 mCi)

What is High Dose Radioactive Iodine Therapy?

High Dose Radioactive Iodine is a treatment that uses a radioactive form of iodine called Iodine 131, used to kill a large portion of your thyroid. It is commonly recommended for patients with a more extensive disease like the following:

  • Papillary Thyroid Cancer
  • Follicular Thyroid Cancer
  • Papillary/Follicular variants

What are the preparations?

Before you undergo this procedure, you may have a man-made type of thyroid stimulating hormone known as recombinant human TSH (rhTSH) for 2 days so your thyroid cancer cells can take up radioactive iodine. You are also encouraged to stop taking your thyroid hormone tablet before the test as it may interfere with the results.

When should you take it?

High Dose Radioactive Iodine Test may be given:

  • After surgery, to kill any cancer cells that may have been left behind
  • To treat thyroid cancer that has spread
  • To treat thyroid cancer that has come back after it was first treated

What should you avoid before the treatment?

The following foods should be avoided as they have high levels of iodine:

  • Fish, seafood
  • Raw green vegetables such as broccoli
  • Pastries made with eggs and butter
  • Milk and white chocolate
  • Take away foods, fast foods, and other foods in which the ingredients are not known
  • Iodized salt
  • Vitamins and mineral supplements

What are the possible side effects after the treatment?

After the procedure, you might experience short-term side effects such as neck tenderness and swelling, nausea and vomiting, swelling and tenderness of the salivary glands, and dry mouth.



For appointments, please email us at nucmed.sfcmc@gmail.com or contact us at (043) 778 4811 loc 8824. You may also visit us on the Ground Floor of the Main Hospital Building from Mondays to Fridays, 8:00 AM to 4:00 PM.



1.2 Low Dose Radioactive Iodine (6-30 mCi)

What is Low Dose Radioactive Iodine Therapy?

Low Dose Radioactive Iodine is commonly given to patients who have already undergone surgery for thyroid cancer. It has fewer side effects and less exposure to radiation, depending on your condition.

This procedure is also used to treat hyperthyroidism caused by the following:

  • Diffuse Toxic Goiter (Grave’s disease)
  • Raw green vegetables such as broccoli
  • Plummer’s Disease (Nodular Toxic Goiter)
  • Autonomously functioning Thyroid Adenoma

What are the preparations?

Before you undergo this procedure, you may have a man-made type of thyroid stimulating hormone known as recombinant human TSH (rhTSH) for 2 days so your thyroid cancer cells can take up radioactive iodine. You are also encouraged to stop taking your thyroid hormone tablets before the test as it may interfere with the results.

When should you take it?

Low Dose Radioactive Iodine Test may be given:

  • After surgery, to kill any cancer cells that may have been left behind
  • To treat thyroid cancer that has spread
  • To treat thyroid cancer that has come back after it was first treated

What should you avoid before the treatment?

The following foods should be avoided as they have high levels of iodine:

  • Fish, seafood
  • Raw green vegetables such as broccoli
  • Pastries made with eggs and butter
  • Milk and white chocolate
  • Take away foods, fast foods, and other foods in which the ingredients are not known
  • Iodized salt
  • Vitamins and mineral supplements

What are the possible side effects after the treatment?

After the procedure, you might experience short-term side effects such as neck tenderness and swelling, nausea and vomiting, swelling and tenderness of the salivary glands, and dry mouth.



For appointments, please email us at nucmed.sfcmc@gmail.com or contact us at (043) 778 4811 loc 8824. You may also visit us on the Ground Floor of the Main Hospital Building from Mondays to Fridays, 8:00 AM to 4:00 PM.