What are considered normal FSH levels?

Normal levels of follicle-stimulating hormone (FSH) depend on the age and gender of the person in question. According to MedlinePlus, normal FSH levels for a female are 4 milli international units per milliliter (mIU/mL) or less before puberty and between 0.3 and 10 mIU/mL during puberty. During a woman's menstruating years, levels between 4.7 and 21.5 mIU/ml are generally considered normal, while a postmenopausal woman may have normal FSH levels between 25.8 and 134.8 mIU/ml. A man's normal FSH levels are usually 5 mIU/ml or less before puberty, between 0.3 and 10 mIU/ml during puberty, and between 1.5 and 12.4 mIU/ml during adulthood.

FSH is an important hormone that plays a critical role in reproduction. In women, normal levels are crucial for egg production, as well as proper levels of another hormone called estradiol. In men, normal levels of this hormone are important for sperm production. However, there is some variation in normal levels, and doctors generally look at a range of normal values ​​rather than pinpointing a single number. For example, a woman with an FSH of 7 may be told that her levels are normal, even though another woman with an FSH of 5 has been told that her levels are normal; sometimes normal values ​​may differ slightly from lab to lab as well.

Discussions around the FSH level often focus on women, as many doctors use these values ​​as a measure of a woman's fertility. In such cases, a woman can be told that her FSH is high, even if she is within the normal range. For example, if a woman has an FSH of 10, many doctors will tell her that she is high, despite the fact that levels below 21.5 are within the normal range for women who have not reached menopause. This is because at age 10 and older, women are said to have a decreased ovarian reserve, which can make it difficult to get pregnant. Levels that are in the high teens or higher may even mean that a woman is nearing menopause.

It is important to note that having normal FSH levels does not necessarily mean that an individual is fertile, and high levels do not always mean that a woman cannot easily conceive. There are other hormones that play a role in reproduction, and these, along with other factors, can also influence its success. Also, there are some medications that can affect the accuracy of FSH testing, which is achieved by drawing blood.

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