Follicle-stimulating hormone (FSH) test helps to determine the fertility issues, helps to test the health of ovaries or testicles, and helps in checking the functioning of the pituitary gland. Luteinizing hormone is also known as Interstitial Cell Stimulating Hormone. Luteinizing hormone test helps to evaluate fertility issues. It helps in evaluating the health of reproductive organs (testicles or ovaries). In women, this test helps to determine ovulation time. This test also helps to evaluate the function of the pituitary gland. The Prolactin test helps to investigate galactorrhea (unexplained flow of breast milk), abnormal discharge from nipples, irregular or absence of menstrual periods, and/or infertility in women. In men, this test helps to diagnose the cause of erectile dysfunction, decreased libido. This test also detects prolactinoma (a pituitary tumor that produces prolactin) and is also used to monitor the ongoing treatment of prolactinoma. The follicle-stimulating hormone (FSH) test is done: • In case of infertility issues in men and women • In case of irregular or absence of menstrual periods in women • In case of low sperm count, low muscle mass or decreased sex drive in men • In case of symptoms of pituitary, or hypothalamic disorder The Luteinizing Hormone (LH) test is done: • In case a woman is unable to get pregnant • In case of irregular or heavy menstrual periods in a woman • To track ovulation during the menstrual cycle • In case of males who have low sperm count, low muscle mass, or decreased sex drive • In case of symptoms of pituitary or hypothalamic disorder • In case of early or delayed puberty in children The Prolactin test is done: • In case of signs and symptoms of increased levels of prolactin • In case of infertility problems • In case of follow-up for treatment of macroprolactin • In case of low levels of testosterone in men • To detect and monitor prolactinoma