If free T3 looks good, why is TSH still a little high? Why hasn't the T3 brought it down enough? | Masterjohn Q&A Files #59

<p>Question: If free T3 looks good, why is TSH still a little high? Why hasn't the T3 brought it down enough?</p> <p>Your thyroid gland makes thyroid hormone. Thyroid hormone increases your metabolic rate and does a lot of related things. Your hypothalamus is governing that by controlling your pituitary, the master endocrine gland, and its secretion of TSH, which is what controls the thyroid gland and makes it make more thyroid hormone.</p> <p>The way that the feedback occurs is that the circulating T4 is converted to T3 inside the cells of the pituitary. That is...