Normal levels of FSH for people assigned female at birth can vary by age and the phase of the menstrual cycle. For example, in the follicular phase, it can range from 1 to 9 international units per liter (IU/L).
Hormonal disruption and other factors can lead to high or low levels. However, many factors can affect FSH levels, including a person’s weight and various health issues.
Follicle-stimulating hormone (FSH) plays an integral role in reproductive processes. Doctors can test FSH levels to assess fertility, among other things.
In people assigned female at birth, FSH helps mature the ovarian follicles that release eggs, called ova. Without the release of FSH, the reproductive cycle cannot continue, as the ovaries will not release an egg.
People assigned male at birth use FSH to support the growth and development of sperm.
Doctors can check FSH levels using a blood test to assess fertility or see if a person is going through menopause. They typically do this alongside tests for other sex hormones, such as testosterone or estrogen.
This article explores what FSH levels are and how FSH tests relate to menopause and fertility.
Sex and gender exist on spectrums. For the purposes of this article, we use “male” and “female” to refer to a person’s sex assigned at birth. Learn more.
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