Log in »

Three-Week Hypothyroid Regimen

This information describes your 3-week hypothyroid regimen. This regimen includes diagnostic tests and your radioactive iodine treatment.

Day 1 of your 3-week hypothyroid regimen is: _________________.

Before your treatment, you will need to stop taking your thyroid medication. Your doctor or nurse will tell you when to stop.

Start following a low-iodine diet ____ days before Day 1 of your regimen. Drink at least 8 (8- ounce) glasses of decaffeinated liquids every day. Your liquids should include water and other beverages listed in the low-iodine diet guidelines. You can find the guidelines in the resource The Low Iodine Diet.

Your 3-week Hypothyroid Regimen

During the first week of your regimen, you will come to the hospital Monday through Thursday. You will have blood work and scans.

During the second week of your regimen, you will receive your treatment.

During the third week of your regimen, you will have a post-treatment scan, which a staff member in Nuclear Medicine will arrange for you.

Below is a typical regimen schedule:

Week 1
Diagnostic Testing
Day 1
(4 to 6 hours)
  • Blood work
  • Diagnostic dose of radioactive iodine
  • Radiation measurement
Day 2
(90 minutes)
  • Blood work
  • Scan
  • Radiation measurement
Day 3
(90 minutes)
  • Blood work
  • Scan
  • Radiation measurement
Day 4
(90 minutes)
  • Blood work
  • Scan
  • Radiation measurement
Week 2
Treatment
(May be Monday - Friday)
Treatment dose of radioactive iodine
Week 3
Follow-up
Post-treatment scan

Other tests that you may have include:

  • A PET scan, which measures the body's use of glucose (a type of sugar). Some tumors use more glucose than normal tissue. This test may give your doctor more information on your condition.
  • A pregnancy test (blood draw) for women before treatment to ensure that they are not pregnant. This is a hospital requirement for treatment.