T3 uptake test | definition of T3 uptake test by Medical dictionary
T3 uptake test
tri·i·o·do·thy·ro·nine up·take 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.
T3 uptake test Triiodothyronine uptake assay, T3 resin uptake A test that indirectly measures free T4 as a reflection of the amount of T3 that can be bound to carrier proteins, in particular to thyroxin-binding globulin. See Thyroxine, Triiodothyronine.