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Doctor insights on: Radioactive Iodine Dangers In Thyroid

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Will the radioactive iodine capsule work for my thyroid uptake scan?

Will the radioactive iodine capsule work for my thyroid uptake scan?

YES: An uptake value will be established. Uptake can be low, normal, or high. Scan will be diagnostic if enough iodine localizes in the thyroid gland. Large amounts of stable iodine from iodized salt and ocean seafood can compete with radiodine and decrease uptake. ...Read more

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Radioactive (Definition)

Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability. Because the nucleus experiences the intense conflict between the two strongest forces in nature, it should not be surprising that there are many nuclear isotopes which are unstable and emit some kind of radiation. The most common types of radiation are called alpha, ...Read more


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What is the significance of radioactive iodine scan in various throid diseases like myxedema, hashimoto's thyroiditis and graves disease?

What is the significance of radioactive iodine scan in various throid diseases like myxedema, hashimoto's thyroiditis and graves disease?

Hot vs. cold nodule: Iodine uptake by thyroid tissue depends on functioning cells. The most common use for thyroid scan is to assess if a nodule is functional or not. A functional/hot nodule may cause hyperthyroidism but is not likely to be malignant. See this site for more info. http://www.nlm.nih.gov/medlineplus/ency/article/003829.htm. ...Read more

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Advice about radioactive iodine for a overactive thyroid?

Advice about radioactive iodine for a overactive thyroid?

Used as treatment: Your thyroid gland uses iodine to produce thyroid hormone. If you have an over-active thyroid gland, one option is to remove/destroy part of the gland. if radioacive iodine is given, the gland will take it up and will be damaged by the radiation, thus reducing the amount of hormone produced. after this occurs, some patients then have too little thyroid and need to take thyroid pills. ...Read more

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What percentage of radio active thyroid iodine patients lose all thyroid function?

What percentage of radio active thyroid iodine patients lose all thyroid function?

Depends on dose: For graves disease, typical doses of rai are 5-25 mci. The dose depends on your uptake and size of gland. Some doctors give low doses to try to make your thyroid normal. But this usually does not work. Either the low dose leaves you still hyperthyroid, or it makes you hypo, just like a higher dose. For this reason, many just give a high-ish dose so you become hypo quickly and go on synthroid (thyroxine). ...Read more

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I have low iodine diet before radio iodine treatment for thyroid cancers?

I have low iodine diet before radio iodine treatment for thyroid cancers?

Pre-treatment: You are on low iodine diet to keep normal iodine from competing with radio-iodine and interfering with the concentration of radio-iodine in the thyroid cancer. Wish you good health. ...Read more

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Does radioactive iodine destroy the entire thyroid? If so, why?

Does radioactive iodine destroy the entire thyroid? If so, why?

RAI...: Radioactive iodine is used for many conditions such as graves disease, thyroid cancer, and hyperfunctioning/autonomous nodules. In each case, a particular dose of radioactive iodine is used to achieve the desired result. Each case is individual and will decide how much of the gland needs to be damaged. ...Read more

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Is kelp harmful for thyroid nodules?

Is kelp harmful for thyroid nodules?

No: Kelp is not harmful for anyone unless they are allergic to it or it is taken in excessive amounts. ...Read more

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What food contains iodine needed for the thyroid gland's production of thyroid hormone?

What food contains iodine needed for the thyroid gland's production of thyroid hormone?

Many foods: The us diet has adequate i levels both in the food and added as stabilizers in many foods and other products as toothpaste and shampoos. If you are hypothyroid you need thyroid hormone in this country. ...Read more

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Radioactive iodine versus partial thyroidectomy, explain please?

Need more info: Radioactive iodine is often used for graves' disease which is a hyperactive thyroid condition. I am assuming you were given this option or partial thyroid removal to control the problem. The radioactive therapy is usually preferred but sometimes surgery is better depending on many issues. You need to discuss with endocrinologist and surgeon. ...Read more

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What turns iodine into tincture of iodine?

What turns iodine into tincture of iodine?

It's formula: From wikipedia: "usp tincture of iodine is defined in the U.S. National formulary (nf) as containing in each 100 ml, 1.8 to 2.2 grams of elemental iodine, and 2.1 to 2.6 grams of sodium iodide. Alcohol is 50 ml and the balance is purified water. This "2% free iodine" solution provides about one mg of free iodine per drop." iodine is neutral i2; iodide is a -1 charged ion (i-). ...Read more

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How will a radioactive iodine uptake test diagnose goiter?

How will a radioactive iodine uptake test diagnose goiter?

It will not: An i131 test does not "diagnose" goiter. Goiter is just a term meaning an enlarged and/or nodular thyroid. An i131 scan is a "fucntional" scan. It is used to determine if a nodule within the thyroid is "hot" - picks up a lot of iodine: hyper-metabolic. A "cold" nodule does not concentrate the iodine: hypometabolic. There is a lower risk of thyroid cancer in "hot" nodules. ...Read more

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Can all food contain iodine needed for the thyroid gland's production of thyroid hormone?

Can all food contain iodine needed for the thyroid gland's production of thyroid hormone?

Variable amounts: Plant food sources contain variable amounts of iodine, depending on the soil content of this mineral. In us you may use iodized salt that would cover the requirement. ...Read more

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Is tyrosine included in thyroid hormone replacement?

Is tyrosine included in thyroid hormone replacement?

Almost never.: I do not dso this and I have never seen it done, although some "shaman" may do this! not necessary, really. ...Read more

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Will thyroid hormones or antithyroid medications interfere with a tc99m pertechnetate thyroid scan?

Will thyroid hormones or antithyroid medications interfere with a tc99m pertechnetate thyroid scan?

Not usually: Technetium is usually trapped by thyroid gland and used to determine in young children and infants the configuration of thyroid gland, hypoplasia, absence, or increased size or hyperplasia, or abnormal location. Radioactive iodine is used in older patients for determine function of thyroid gland, increased function or hyperthyroiidism or decreased function, hypothyroidism. ...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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Iodine deficiency thyroid; will taking iodine correct it?

Yes: Iodine deficiency will cause hypothyroidism and enlargement (goiter) of the thyroid. Do not take more than about 1000 mcg of iodine because high doses can cause problems if you have hashimoto's thyroiditis. Also, 2 recents reports from china and japan have suggested that high doses of iodine may increase the risk of thyroid cancer. Too much of a good thing is then not good. ...Read more

Dr. Hamid Sajjadi
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Thyroid (Definition)

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