| iodine radioisotopes | Unstable isotopes of iodine that decay or disintegrate emitting radiation. I atoms with atomic weights 117-139, except I 127, are radioactive iodine isotopes. (12 Dec 1998) |
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| iodine reaction of epinephrine | A reaction resulting from the oxidation of the hormone, a faint pink colour appearing upon the addition of iodine. (05 Mar 2000) |
| iodine stain | <technique> A stain to detect amyloid, cellulose, chitin, starch, carotenes, and glycogen, and to stain amoebas by virtue of their glycogen; faeces and other wet preparations are stained directly with Lugol's iodine solution; smears are treated with Schaudinn's fixative and then stained with alcoholic iodine, followed by Heidenhain's iron haematoxylin. (05 Mar 2000) |
| iodine test | A test for detecting the presence of starch based on its reaction with iodine. (05 Mar 2000) |
| iodine tincture | A hydroalcoholic solution containing 2% elemental iodine and 2.4% potassium iodide to facilitate dissolution and 47% alcohol; used as an antiseptic/germicide on the skin surface for cuts and scratches. Has been used as a skin disinfectant before surgery but is now largely replaced by organic forms of iodine. (05 Mar 2000) |
| iodine uptake test | A test of thyroid function in which 131I-iodide is given orally; after 24 hours, the amount present in the thyroid gland is measured and compared with normal values. Synonym: radioactive iodide uptake test, RAI test. (05 Mar 2000) |
| iodine value | An indication of the quantity of unsaturated fatty acids present in a fat; it represents the number of grams of iodine absorbed by each 100 g of fat. See: hydrogen number. Synonym: iodine value. (05 Mar 2000) |
| iodine-123 | <radiobiology> A radioisotope of iodine with a 159 keV gamma emission and a physical half-life of 13.2 hr, frequently used for studies of thyroid disease and of renal function. (05 Mar 2000) |
| iodine-125 | <radiobiology> Radioactive iodine isotope that decays by K-capture (internal conversion) with a half-life of 59.4 days; used as a tracer in thyroid studies and as a label in immunoassay and in imaging. (05 Mar 2000) |
| iodine-127 | <radiobiology> Stable, nonradioactive iodine, the most abundant iodide isotope found in nature; dietary deficiency causes simple goiter; used to block thyroid uptake of radioactive iodine released from nuclear accidents. (05 Mar 2000) |
| iodine-131 | <radiobiology> A radioactive iodine isotope, 364 keV peak beta and gamma emitter with a half-life of 8 days. It is used as a tracer in thyroid studies, as therapy in hyperthyroidism, thyroid cancer, and heart disease, and as a label in immunoassay and imaging. (22 Sep 2002) |
| iodine-132 | <radiobiology> A beta-and gamma-emitting radioisotope of iodine with a physical half-life of 2.28 hr, usually obtained from a tellurium-132 radionuclide generator; its clinical use has been supplanted by 131I and 123I. (05 Mar 2000) |
| iodine-fast | Denoting hyperthyroidism unresponsive to iodine therapy, which develops frequently in most cases so treated. (05 Mar 2000) |
| iodine-induced hyperthyroidism | <endocrinology> Induction of thyrotoxicosis in a previously euthyroid individual as a result of exposure to large quantities of iodine. It occurs most often in areas of endemic iodine-deficient goiter and in patients with multinodular goiter. It can also can develop following use of iodine-containing agents for diagnostic studies. Synonym: iodine-induced hyperthyroidism. (05 Mar 2000) |
| iodinophil | 1. Staining readily with iodine. Synonym: iodinophilous. 2. Any histologic element that stains readily with iodine. Origin: iodine + G. Philos, fond (05 Mar 2000) |