Thyroid uptake scan
Informed by recognized medical guidance
Overview
A thyroid uptake scan is a test that shows how well your thyroid gland absorbs iodine. It helps doctors check if your thyroid is working too hard, not hard enough, or if there are lumps or nodules. The scan uses a small amount of radioactive iodine (tracer) that is swallowed or injected, and a special camera takes pictures of your thyroid.
Key facts
- The scan uses a very small amount of radiation, similar to an X-ray, and is safe for most people.
- You may need to avoid iodine-rich foods or some medicines before the scan – your doctor will give specific instructions.
- The test usually takes about 30 minutes, but you may need to come back a few hours after taking the tracer for the scan.
Thyroid uptake scans are not done routinely for everyone, but they are a common test when your doctor suspects a thyroid problem, especially if your thyroid hormone levels are abnormal or you have a lump in your neck.
The test is used for people of all ages who have signs of thyroid issues, such as unexplained weight changes, tiredness, a swelling in the neck, or heart palpitations. Your doctor will decide if this scan is right for you.