The primary thyroid hormones are T3 and T4, which are the active form and the storage form of the hormones, respectively. T4 is circulated throughout the bloodstream and stored in tissues so that it’s available when needed. When that need arises the body needs to convert it to T3 which is the active thyroid hormone.
T3 is a biologically important hormone that is vital to the growth and development of every cell and organ in the body, making it the most important hormone in the growth of a child and in adult’s metabolism. The thyroid makes only a small amount of T3 while the majority made is T4. When denoted as fT3 and fT4, it means they are not bound by protein making it is best way to test the health of the thyroid.
fT4 and fT3 are both important markers to determine your thyroid’s health. Both types of thyroid hormones are necessary for complete and optimal health assessment. The best range to be in was in the upper quarter of the normal range for fT3 and in the middle of the normal range of fT4. When this happens, nearly all hypo patinets achieve a level of symptom relief that taking T4 alone can’t provide.
Achieving an optimal range requires patience and diligence, care, and attention. It is can be easy to run too high or too low which is why regular testing and adjustment of medications are necessary, only in so long as your symptoms dictate."
Source : https://www.functionalthyroidcare.com
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