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Why TSH is not the Best Marker of Thyroid Function

TSH stands for Thyroid Stimulating Hormone and is produced by the pituitary gland in the brain. The simplistic view of produced hormones looks like this: TRH (Hypothalamus – part of the brain) -> TSH (Pituitary – part of the brain) -> Thyroid hormone Free T4 (Thyroid) -> Conversion of Free T4 to Free T3. TSH