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 paraventricular ...
High TSH levels can mean you have an underactive thyroid or a pituitary gland tumor. Low TSH levels can mean you have an overactive thyroid or issues with the pituitary gland. TSH levels are first ...
Verywell Health on MSN
Thyroid blood tests: Types and what results mean
Thyroid blood tests help figure out how well your thyroid gland is working. TSH helps the thyroid gland know when to make ...
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