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Doctor insights on: Nuclear Medicine Study Thyroid Scan

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Thyroid Scan (Definition)

The patient ingests radioactive iodine or has intravenous injection of radiotracer technetium to define structure, size, and function of thyroid gland. Overactive ( hyperthyroid) normal, and underactive thyroid glands are determined. Sometimes autoimmune conditions and tumors of the gland can be suspected. Correlative imaging ultrasound, mr imaging, and blood tests ...Read more


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How long do I have to wait after a nuclear medicine thyroid scan, i-123, to have a fna biopsy and/or thyroid blood tests?

How long do I have to wait after a nuclear medicine thyroid scan, i-123, to have a fna biopsy and/or thyroid blood tests?

You don't wait.: Generaly speaking you do not need to wait at all after having an I 123 thyroid scan to have a biopsy. You usually have the biopsy scheduled after the results of the thyroid scan are interpreted which usually takes a day. The radiation from the I 123 is minimal . ...Read more

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My tsh level showing 9.1 . my doc did an anti tpo check value is normal (26) . also did thyroid scan , it is also normal . doctor didn't prescribe any medicine. bit confused what could be reason for high TSH

My tsh level showing 9.1 . my doc did an anti tpo check value is normal (26) . also did thyroid scan , it is also normal . doctor didn't prescribe any medicine. bit confused what could be reason for high TSH

Low thyroid: Although most thyroid disease is caused by an autoimmune disorder, some people's thyroid may just not be functioning well. You need to get this test repeated plus getting thyroid hormone level at the same time to make sure this was not a lab error. It may be a good idea to consult an endocrinologist as well. ...Read more

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What information do I have to bring along to do the thyroid scan?

What information do I have to bring along to do the thyroid scan?

Blood tests: It is helpful to bring along any recent thyroid function tests, such as a TSH level. Also, any recent x-rays, such as a ct scan utilizing contrast could affect the scan. What has your diet been? This may be helpful, especially if you've been eating lots of seafood. Why are you getting the scan? Any information regarding the clinical question being asked would be helpful. ...Read more

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What does a thyroid scan check for?

What does a thyroid scan check for?

Different things: We use thyroid scans to help distinguish between functioning and non-functioning thyroid nodules, to assess activity of the thyroid for purposes of ablation in cases of grave's disease, to follow up patients who've had their thyroid glands removed because of cancer. ...Read more

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Whats the low iodine diet for the thyroid scan?

Whats the low iodine diet for the thyroid scan?

Preparation: Some diagnostic centers ask patients to undergo a 2 week low-iodine diet prior to a thyroid uptake and scan. This is because the study uses radioactive iodine (i-123 or low i-131) for the test. The iodine contained in food (seafood, table salt, etc.) may compete with the iodine used for the study, and thus results may be biased.Ideally, for the study your thyroid gland should be "hungry" for iodine. ...Read more

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How soon after a thyroid scan should you wait before an uptake scan?

How soon after a thyroid scan should you wait before an uptake scan?

One after the other: The exact scanning time after taking the capsule varies according to the isotope and protocol used. For i-123 and low i-131 the uptake and the scan is usually done at 24 hours. A thyroid probe directed to your neck measures the radioiodine uptake, this is follow by a gamma camera scan which makes an image of your thyroid gland based on the radioiodine distribution. ...Read more

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Cn thyroid scan diffrentiate between benign n malignant follicular neoplsm?

NO : Hi. Nope, you need tissue (cells). Either an FNA for cytology (which may be non-diagnostic) or a surgical biopsy. Scan adds nothing to the diagnostic evaluation ...Read more

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Need doctor's help! what do I have to do after my thyroid scan?

Need doctor's help! what do I have to do after my thyroid scan?

Thyroid scan...: There is nothing specific to do until you receive the results. Contact your doctor and discuss the results of the test to determine if any other workup is needed. ...Read more

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What does a thyroid scan do?

What does a thyroid scan do?

Thyroid scan: It's a nuclear medicine scan use to evaluate how well your thyroid is working. The result will give information on the size, shape, location and the overall activity of the gland. It can also tell you if a thyroid nodule is functioning or non-functioning and help your doctor determine whether a nodule biopsy is needed. More info with the link below: http://www.Webmd.Com/a-to-z-guides/thyroid-scan. ...Read more

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How is the thyroid scan performed?

How is the thyroid scan performed?

2 types of "scans": Thyroid ultrasounds are quick and painless. They are done with some jelly on the neck and sound waves are used to visualize the thyroid and surrounding tissues. Nuclear medicine scans are done by swallowing a small amount of radioactive iodine. After some time, the iodine finds its way to thyroid tissue and "lights up" on the scan. This is painless, safe, but does take a while. Best wishes. ...Read more

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What's the purpose of thyroid scan?

What's the purpose of thyroid scan?

A thyroid scan: Uses a radioactive tracer and a special camera to measure how much tracer the thyroid gland absorbs from the blood. A thyroid scan can show the size, shape, and location of the thyroid gland. It also finds areas that are overactive or underactive and to evaluate possible masses that may be felt or seen with ultrasound. ...Read more

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How long does a thyroid scan test take?

How long does a thyroid scan test take?

Varies: A thyroid uptake and scan may be done with different isotopes and protocols resulting in scan time variation. Typically is done with i-123; you take the capsule one day and you come back the next day at 24 hr for a neck scan that takes aprox 15-20 minutes. In certain circumstances some places do this scan at 4-6 hours after you take the capsule. ...Read more

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How expensive is it to get a thyroid scan?

How expensive is it to get a thyroid scan?

Depends: Usually this is covered by your insurance. If you get a radioiodine thyroid scan it will be more expensive than a tc99m pertechnetate scan. Are you getting a scan alone or scan plus uptake? That will affect costs. I am estimating that you are looking at costs in the range of a hundred to several hundred dollars but these costs are generally set by the administration / management and not physician. ...Read more

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What do I have to do before my thyroid scan?

What do I have to do before my thyroid scan?

If hyperthyroidism: If you are having a diagnostic dose of i-123 (usually 200 microci), you should stop taking anti-thyroid medications (methimazole and ptu) and make sure you didn't have iodine-based IV contrast (used in ct scans) in the prior 6-8 weeks. For a diagnostic study a low-iodine diet is not require, unless you are going to received i-131 treatment shortly after the test. ...Read more

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What should I have to do after my thyroid scan?

What should I have to do after my thyroid scan?

Resume daily life: If thyroid scan was performed with iodine 123 or technetium 99m pertechnetate involves a low amount of radiation. The half lives are short enough (13 and 6 hours) that most irradiation will have dissipated by 24-48 hours. Whatever i123 does not accumulate in thyroid gland are excreted via kidneys, saliva, and sweat. Tc 99m usually exits via kidneys, GI tract, and saliva. I131 involves higher dose. ...Read more

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When getting a thyroid scan, what's the procedure?

When getting a thyroid scan, what's the procedure?

Thyroid scan..: There are two types of nuclear thyroid scan. One involves IV injection of a tracer. The other involves ingestion of a radioactive iodine pill. The pill is more common....Usually you will be told not to consume foods with high iodine content for a few days before scan. 1st day you ingest the pill and you come back the next day for images of the neck on a gamma camera and calculation of uptake. ...Read more

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What is the definition or description of: thyroid scan?

Thyroid function: The patient ingests radioactive iodine or has intravenous injection of radiotracer technetium to define structure, size, and function of thyroid gland. Overactive ( hyperthyroid) normal, and underactive thyroid glands are determined. Sometimes autoimmune conditions and tumors of the gland can be suspected. Correlative imaging ultrasound, mr imaging, and blood tests are used for confirmation. ...Read more

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What is the definition or description of: thyroid scan with i 123?

What is the definition or description of: thyroid scan with i 123?

Thyroid evaluation: The isotope iodine 123 is ingested by patient. It is absorbed into blood stream and accumulates in the thyroid gland.The function of gland is determined by uptake of isotope by gland, increased (hyper), normal, or decreased (hypo). The structure of the gland is visualized showing size, location, and texture (homogeneous or nodular).. Nodules can be hypo- or hyperfunctioning, benign or malignant. ...Read more

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I am having a thyroid scan done. What types of food should I avoid until after the scan?

Thyroid scan prep: Generally eat nothing 2 hours before the test. Avoid foods with iodine—shellfish, iodized salt, or kelp (seaweed, including nori on sushi). Your doc should advise you concerning meds that may interfere with the test (ones with iodine, such as cough syrups, multivitamins, or the heart medicine amiodarone; thyroid meds). ...Read more

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Just got the results of thyroid scan. The range is 5% to 30% in 24hrs. Mine's is 64% first day, 70% second day and 64.8% for the last day. Help!?

Hyperthyroidism: Your values of thyroid uptake are increased indicative of probable graves disease or hyperthyroidism especially if scan showed homogeneous enlarged thyroid.Sometimes oral medication is used to control hyperthyroidism.Sometimes medical therapy does not maintain control of disease. Some people have radioactive ablation of thyroid with i131which destroys gland, patient takes daily hormone supplements. ...Read more

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Would a thyroid scan rule out everything no matter what the blood test resuslts were?

Would a thyroid scan rule out everything no matter what the blood test resuslts were?

No: Thyroid scan is only part of thyroid dysfunction workup. Thyroid scan usually shows functioning or nonfunctioning nodules, thyroid gland enlargement, decreased function, or goiter. Laboratory blood testing is extremely important in determining function of thyroid gland, hypo-, hyper-, or normal. Sometimes scan and blood tests differ in findings. ...Read more

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I'm due to have a thyroid scan in 3 days. Yesterday, I took two 25 mg antihistamine pills. Will this affect the results?

I'm due to have a thyroid scan in 3 days.  Yesterday, I took two 25 mg antihistamine pills.  Will this affect the results?

No, it should not.: The half life of most antihistamines should be less than 24 hrs and should be out of the system by then. I would check with the radiology center to confirm their policy. I would also avoid any more antihistamines until the time of testing. ...Read more

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What type of doctor can order a thyroid scan?

Many: A thyroid scan gives info about metabolic activity in the thyroid gland. Almost any doctor involved in general medical care would be able to order this test if the patients history or physical findings supported the need. Depending on test results you may require follow up with an endocrinologist or a surgeon. ...Read more

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Is a thyroid scan and raidioactive throid treatment the same?

No: A thyroid scan is a study that exposes you to a small amount of radiation and allows the radiologist to see images of the thyroid. A radioactive thyroid treatment is when you are given very large amounts of radiation in order to "kill" the overactive thyroid or thyroid cancer. ...Read more

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Dr. TAPAN CHAUDHURI
106 doctors shared insights

Nuclear Medicine (Definition)

The medical specialty of nuclear medicine involves the use of unsealed radioactive pharmaceuticals that can help image molecular flow throughout the body. The medical use of radiopharmaceuticals also includes the treatment of some cancers and bone pain. Nuclear medicine is separate from diagnostic radiology, which utilizes the use of external (sealed) radioactivity ...Read more


Dr. Milroy Samuel
13 doctors shared insights

Thyroid (Definition)

The thyroid is an endocrine gland that sits in the lower part of the neck. It produces thyroid hormone - which ...Read more