What is a WB 131-Iodine Scan?
This scan is done after thyroid cancer surgery. It helps check if any thyroid tissue is left in the body.
It also helps doctors decide if further treatment, like radioiodine therapy, is needed.
Later, this scan can be used during regular follow-ups to make sure the cancer hasn’t returned or spread.
How to Prepare for the Scan
- You must fast for 2 hours before taking the iodine dose.
- The scan happens 24 to 48 hours later, depending on your case.
- No fasting is needed on the scan day.
- Pregnant women should inform us. A test may be needed. The scan is usually avoided during pregnancy.
- Breastfeeding mothers should store milk in advance. Breastfeeding can start again after 24 hours.
- Wear loose, comfortable clothes and avoid jewellery.
What to Bring on the Scan Day
To make your visit smooth, please bring:
- A doctor’s note or scan request
- Your full medical file, including current medicines and allergy details
- Previous reports, especially:
- Thyroid hormone tests (T3, T4, TSH, Serum TG, Anti-TG)
- Thyroid surgery or cancer details
- Neck ultrasound (USG) report
- Only one person to accompany you
- Some home-cooked food to eat after the scan
Time Required for the Scan
- Day 1: Iodine dose is given (after fasting)
- Day 2 or 3: Scan is done after 24–48 hours
- Scan time: About 30 to 45 minutes
- Total duration: 2 to 3 days, including waiting time
After the Scan
- You can eat, drink, and take your medicines as usual
- You will stay under observation for about 30 minutes before leaving
- Avoid close contact with children or pregnant women for the rest of the day
- Drink more water to help flush the iodine out of your body