radioactive iodine uptake

uptake

 [up´tāk]

absorption and incorporation of a substance by living tissue.

biologic uptake movement of hazardous substances from the environment into the tissues of plants or animals.

radioactive iodine uptake (radioiodine uptake) uptake of radioiodine from the blood by the thyroid gland; see radioiodine uptake test.

T3 resin uptake (triiodothyronine resin uptake) the uptake of radioactive triiodothyronine at binding sites on resin, contrasted to uptake at sites on thyroxine-binding globulin in the triiodothyronine resin uptake test.

Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

radioactive iodine uptake

RAIU, thyroid scan, thyroid scintigraphy Nuclear medicine A method of assessing thyroid function, using radioactive iodine–eg, 131I or 123I; ↑ in hyperthyroidism, ectopic hormone production, iodine deficiency, and in response to thyroid hormone depletion; ↓ in hypothyroidism, after administration of exogenous thyroid hormone, in defects of hormone storage, after exposure to iodine overload Normal range 5-25%. See T3, T4, TSH.

McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.