FREE TRIIODOTHYRONINE (FT3) (THY)
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This test measures the level of triiodothyronine (T3) in your blood.
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This test measures the level of triiodothyronine (T3) in your blood. T3 is one of two major hormones made by your thyroid, a small, butterfly-shaped gland located near the throat. The other hormone is called thyroxine (T4.)