Levels of thyroid hormones in serum are tightly regulated by the hypothalamic-pituitary-thyroid axis (Figure 1). Hypothalamic TSH-releasing hormone (TRH) is secreted mainly from the ...
FT3I - Free triiodothyronine index (FT3I) is based on the level of T3, the form of thyroid hormone with 3 atoms of iodine per molecule. FT3I is checked when TSH is abnormal, but FT4 or FT4I is normal.
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