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Thyroid scan
thyroid scan · thyroid scintigraphy · nuclear thyroid scan · thyroid uptake scan
A small dose of a tracer substance is injected into a vein. The thyroid takes it up, and a camera shows which areas are more active.
For an overactive thyroid, to find the cause, or for thyroid nodules, to see which are active.
⏱ Duration: the whole visit usually takes 1 to 2 hours; the report in 1 to 2 days
Be sure to tell your doctor
How to prepare
- Iodine. Iodine supplements are usually stopped a few weeks before the test. Ask the clinic how long.
- Medicines. Thyroid medicines are sometimes paused. Do not do this on your own. Tell your doctor. They will decide.
- Metal. Take off necklaces and jewelry from your neck.
What to bring
- Your referral
- Thyroid hormone test results
- Your thyroid ultrasound
How it goes
- You get an injection into a vein
- You wait about 15 to 30 minutes
- You lie on your back with your head tilted back a little
- The camera is placed over your neck. Keep still and try not to swallow
- The scan takes a few minutes
What you'll feel
- The injection feels like giving blood
- You do not feel the tracer at all
Afterwards
- You can go on with your normal day
- Drink water and use the toilet more often
- Ask the clinic about breastfeeding and contact with babies
- Take the report to an endocrinologist
Common questions
Why no iodine before the test?
Iodine fills up the thyroid, so the tracer is not taken up well. The scan will not be accurate.
Does it replace an ultrasound?
No. Ultrasound shows the structure, and the scan shows how the gland works. They are often done together.