FSH

FSH works closely with another hormone called LH to control sexual functions. In women, these tests help find the cause of infertility, assess ovarian function, find the reason for irregular or stopped menstrual periods, and confirm the start of menopause or perimenopause. In men, these tests can find the cause of infertility, the reason for a low sperm count, or a problem with the testicles. In children, these tests can help diagnose early or delayed puberty.