triiodothyronine resin uptake test

(for thyroid function) determination of the number of sites on thyroxine-binding globulin (TBG) that are occupied by endogenous triiodothyronine (T3) and how many sites remain available. An excess of radioactive exogenous triiodothyronine is added to the sample, followed by the addition of a resin that also binds T3. A portion of the radioactive T3 binds to sites on TBG not already occupied by endogenous thyroid hormones, and the remainder binds to the resin. The amount of labeled hormones bound to the resin (the triiodothyronine resin uptake) can be subtracted from the total that was added and the remainder is the amount that bound to the unoccupied binding sites on the thyroxine-binding globulin. Called also T3 resin uptake t.

Medical dictionary. 2011.

Look at other dictionaries:

  • 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 (see under test) …   Medical dictionary

  • T3 resin uptake test — triiodothyronine resin uptake t …   Medical dictionary

  • test — 1. To prove; to try a substance; to determine the chemical nature of a substance by means of reagents. 2. A method of examination, as to determine the presence or absence of a definite disease or of some substance in any of the fluids, tissues,… …   Medical dictionary

  • thyroid function test — any of various diagnostic procedures measuring the functioning of the thyroid gland, such as the perchlorate discharge test, protein bound iodine test, radioactive iodine uptake test, thyroid stimulating hormone test, thyroid suppression test,… …   Medical dictionary

  • therapeutics — /ther euh pyooh tiks/, n. (used with a sing. v.) the branch of medicine concerned with the remedial treatment of disease. [1665 75; see THERAPEUTIC, ICS] * * * Treatment and care to combat disease or alleviate pain or injury. Its tools include… …   Universalium

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