tri-iodothyronine(redirected from tri-iodothyronine uptake)
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Related to tri-iodothyronine uptake: free thyroxine index
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.
the uptake of the compound by red blood cells is used as a measure of thyroid function. Called also T3 uptake.