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A free or total triiodothyronine (free T3 or total T3) test is used to assess thyroid gland function and to diagnose a thyroid disorder.
Thyroid function tests are a series of blood tests used to measure how well your thyroid gland is working. Available tests include the T3, T3RU, T4, and TSH. The thyroid is a small gland located in the lower-front part of your neck.