Follicle-stimulating hormone (FSH) is a hormone found in humans and other animals. It is synthesized and secreted by gonadotropes of the anterior pituitary gland. FSH regulates the development, growth, pubertal maturation, and reproductive processes of the body. FSH and Luteinizing hormone (LH) act synergistically in reproduction.
High FSH levels
Reference ranges for luteinizing hormone and follicle-stimulating hormone in the menstrual cycle, expressed in international units. The scale is logarithmic.
The most common reason for high serum FSH concentration is in a female who is undergoing or has recently undergone menopause. High levels of Follicle-Stimulating Hormone indicate that the normal restricting feedback from the gonad is absent, leading to an unrestricted pituitary FSH production.
If high FSH levels occur during the reproductive years, it is abnormal. It may be a sign of:
1. Premature menopause also known as Premature Ovarian Failure
2. Poor ovarian reserve also known as Premature Ovarian Aging
3. Gonadal dysgenesis, Turner syndrome
4. Castration
5. Swyer syndrome
6. Certain forms of CAH
7. Testicular failure.
FSH is available mixed with LH activity in various menotropins including more purified forms of urinary gonadotropins such as Menopur, as well as without LH activity as recombinant FSH (Gonal F, Follistim). It is used commonly in infertility therapy to stimulate follicular development, notably in IVF therapy, as well as with interuterine insemination (IUI). (See Gonadotropin Preparations.)
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