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Four tests â thyroid-stimulating hormone (TSH), Free T3, Free T4 and thyroid antibodies â are required to accurately assess the function of the thyroid gland, our master gland of metabolism. An optimal TSH level should be less than 2.0, not the currently accepted 4.7 reported by most labs.
Your thyroid gland controls the metabolism of all your cells. Your pituitary gland releases a hormone known as TSH (thyroid stimulating hormone) to stimulate your thyroid. Your thyroid then releases two hormones, T3 and T4, which control your metabolism.n hypothyroidism (also known as underactive thyroid), your thyroid does not produce enough of these hormones. There are three types of hypothyroidism: primary, secondary, and tertiary. In secondary hypothyroidism, your pituitary gland isnât stimulating your thyroid to produce enough hormones.