TSH – a misleading test for thyroid function
TSH stands for Thyroid Stimulating Hormone. It is not your thyroid hormone. TSH is an indirect way to assess the level of the thyroid hormone. Often, it is a misleading test for the thyroid function.
Normal TSH does not always mean normal thyroid function
TSH is a hormone produced by the pituitary gland in response to T3 level inside the pituitary gland. There is an inverse relationship between TSH and T3 level inside the pituitary gland. Consequently, if your pituitary gland senses T3 to be low, it produces more TSH, which is a message for the thyroid gland to produce more thyroid hormone. Conversely, if T3 is high, then pituitary gland produces less TSH, telling thyroid gland to produce less thyroid hormone. In this way, pituitary gland tries to regulate thyroid hormone production by the thyroid gland.
Your TSH may be in the normal range while you are actually hypothyroid
Your TSH is a reflection of what is going on in your pituitary gland, not necessarily what is happening in the rest of the body, such as your muscles, skin, fat, liver, kidneys and heart. Therefore, your pituitary may be normal, but not the rest of the body, as far as the thyroid hormones are concerned. I have seen it repeatedly in my patients..... MORE
https://doctorzaidi.com/tsh-misleading-test-thyroid-function/
