Radioactive iodine scan (RAI)
Purpose of a RAI Scan:
- It is a procedure to find areas in the body where thyroid cancer cells may be dividing quickly.
What is a RAI Scan?:
- Radioactive iodine (RAI) is used because only thyroid cells take up iodine.
- A very small amount of RAI is swallowed.
- It travels through the blood, and collects in thyroid tissue and thyroid cancer cells anywhere in the body.
- Abnormal thyroid cells take up less iodine than normal thyroid tissue.
- Areas that do not absorb the iodine normally (cold spots) show up lighter in the picture made by the scan.
- Cold spots can be either benign (not cancer) or malignant , so a biopsy is done to find out if they are cancer.
Please follow the link for the instructions of How to prepare for your RAI scan.