triiodothyronine 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(s): T3 uptake test
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Examples: glitazone, GI cocktail, etc.