| t3 | <endocrinology, hormone> One of two main hormones produced by the thyroid gland. Free triiodothyronine is that not bound by thyroid binding globulin in the plasma and the levels are are high in hyperthyroidism, nephrotic syndrome and renal failure and low in acute hepatitis, hypothyroidism and pregnancy. Abbreviation: T3 (27 Sep 1997) |
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| T3 uptake test | A test of thyroid function in which triiodothyronine (T3) is added to a patient's serum in vitro to measure the relative affinities of serum proteins and of an added competitive substance for T3; higher T3 uptakes are associated with hyperthyroidism. Synonym: T3 uptake test. (05 Mar 2000) |