tri-iodothyronine

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tri-iodothyronine

one of the thyroid hormones; an organic iodine-containing compound liberated from thyroglobulin by hydrolysis. It has several times the biological activity of thyroxine. Called also T3.

tri-iodothyronine (T3) suppression test
the difference between the serum levels of T3 and T4 before and after oral administration of tri-iodothyronine for two days. With normal thyroid function, there is a marked decrease in T3 levels, but in hyperthyroidism there is little change. Used in cats when other laboratory indicators are ambiguous.
tri-iodothyronine uptake
the uptake of the compound by red blood cells is used as a measure of thyroid function. Called also T3 uptake.