What is it used for?An LH test works closely with another hormone called follicle-stimulating hormone (FSH) to control sexual functions. So an FSH test is often done along with an LH 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 when ovulation occurs, this is the time when you are most likely to get pregnant.Find the reason for irregular or stopped menstrual periods.Confirm 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. LH 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 the reason for low sex driveIn 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 hasn't started by age 13 in girls and by age 14 in boys.
