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TSH Tells You Almost Nothing Without FT4 — A Field Guide to Reading the Thyroid Index the Way Endocrinologists Do
A TSH of 5.8 on its own looks like hypothyroidism. Read alongside a normal FT4,…
Thyroid Index Field Guide: When TSH, FT4, and FT3 Patterns Decide Overt vs Subclinical vs Central Disease
A thyroid panel does not give a diagnosis. It gives a three-number pattern, and the…