What is it used for?FSH works closely with another hormone called luteinizing hormone to control sexual functions. So a luteinizing hormone test is often done along with an FSH test. These tests are used in different ways, depending on whether you are a woman, man, or child.In women, these tests are most often used to:Help find the cause of infertilityFind out if there is a problem with ovarian functionFind the reason for irregular or stopped menstrual periodsConfirm the start of menopause, or perimenopause. Menopause is the time in a woman's life when her menstrual periods have stopped and she can't become pregnant anymore. It usually starts when a woman is around 50 years old. Perimenopause is the transition period before menopause. It can last for several years. FSH testing may be done towards the end of this transition.In men, these tests are most often used to:Help find the cause of infertilityFind the reason for a low sperm countFind out if there is a problem with the testiclesIn children, these tests are most often used to help diagnose early or delayed puberty.Puberty is considered early if it starts before age 9 in girls and before age 10 in boys.Puberty is considered delayed if it hasn't started by age 13 in girls and by age 14 in boys.
