Radioiodine
An isotope of the chemical element iodine that is radioactive. Radioiodine is used in diagnostic tests as well as in radiotherapy of an hyperactive thyroid gland (hyperthyroidism), most often due to Graves disease. For hyperthyroidism, radioiodine is administered in capsule form on a one- time basis. It directly radiates thyroid tissues, thereby destroying them. It takes 8-12 weeks for the thyroid to become euthyroid (normal) after treatment. The majority of patients undergoing this treatment eventually become hypothyroid, which is easily treated using thyroid hormones (levothyroxine). Radioiodine should not be used during pregnancy or breast feeding. Radioiodine is the preferred initial therapy for the hyperthyroidism of Graves disease in North America while antithyroid drugs are used as the first line of treatment in most of the rest of the world.
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A radioactive isotope of iodine; e.g., 123I.

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ra·dio·io·dine -'ī-ə-.dīn, -əd-ən, -ə-.dēn n radioactive iodine esp IODINE-131

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ra·dio·io·dine (ra″de-o-iґo-dīn) any of the nine radioactive isotopes of iodine; 131I, 125I, and 123I are the most commonly used in the diagnosis and treatment of both benign and malignant disease of the thyroid gland and in the scintiscanning of such organs as the lung, liver, and kidney.

Medical dictionary. 2011.

Look at other dictionaries:

  • radioiodine — /ray dee oh uy euh duyn , din, deen /, n. Chem. any of nine radioisotopes of iodine, esp. iodine 131 and iodine 125, used as radioactive tracers in research and clinical diagnosis and treatment. [1935 40; RADIO + IODINE] * * * …   Universalium

  • radioiodine — noun The radioactive isotope of iodine, , having a half life of 8 days; used as a medical tracer Syn: iodine 131 …   Wiktionary

  • radioiodine — n. radioactive isotope of iodine (Chemistry) …   English contemporary dictionary

  • radioiodine — ra·dio·iodine …   English syllables

  • radioiodine — ra•di•o•i•o•dine [[t]ˌreɪ di oʊˈaɪ əˌdaɪn, dɪn, ˌdin[/t]] n. chem. med any of nine radioisotopes of iodine, esp. iodine 131 and iodine 125, used as radioactive tracers in research and clinical diagnosis and treatment • Etymology: 1935–40 …   From formal English to slang

  • radioiodine — |rādē(ˌ)ō+ noun Etymology: radio + iodine : radioactive iodine; especially : iodine 131 * * * /ray dee oh uy euh duyn , din, deen /, n. Chem. any of nine radioisotopes of iodine, esp. iodine 131 and iodine 125, used as radioactive tracers in… …   Useful english dictionary

  • radioiodine uptake test — radioactive iodine uptake t …   Medical dictionary

  • Hyperthyroidism — Classification and external resources Triiodothyronine (T3, pictured) and thyroxine (T4) are both forms of thyroid hormone. ICD 10 …   Wikipedia

  • Graves' disease — Classification and external resources Photo showing the classic finding of proptosis and lid retraction in Graves disease ICD 10 …   Wikipedia

  • Thyroid — Infobox Anatomy Name = Thyroid Latin = glandula thyroidea GraySubject = 272 GrayPage = 1269 Caption = Endocrine system Caption2 = Thyroid and parathyroid. Precursor = 4th Branchial pouch System = endocinal jubachina system Artery = superior… …   Wikipedia

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