Follicle Stimulating Hormone is a hormone produced by the pituitary gland in the brain that stimulates the testicles to produce sperm in males and causes eggs to mature in females. It is commonly measured in women who are approaching menopause or who are suffering from menopausal symptoms to gauge whether they are nearing the end of their reproductive life. Raised levels of FSH in a blood test would signal that the ovaries are struggling to produce eggs.
T3 (triiodothyronine) is the biologically active thyroid hormone produced by the thyroid gland. Some T3 is bound to proteins in our blood and therefore is unavailable to our cells. Free T3 is the unbound or available T3 and can be a better measure of thyroid status than a T3 blood test.
T4 or thyroxidine is the main hormone produced by the thyroid gland. Some T4 will attach to proteins in the blood which means that it is not available to be converted to T3, the biologically active thyroid hormone. A blood test to measure Free T4 can be a more active measure of available T4.
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