Empirical Thyrotropin-Free Thyroxine Relationship Across the Thyrotropin Spectrum and Implications for Reference Intervals
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Background: The relationship between thyrotropin (TSH) and free thyroxine (FT4) is commonly assumed to be log-linear. However, this assumption may oversimplify hypothalamic-pituitary-thyroid axis regulation. Characterizing the em... ...
