Follicle-stimulating hormone (FSH), also known as follicle-stimulating hormone, is secreted by pituitary gland. The production of follicle-stimulating hormone is controlled by hypothalamic gonadotropin releasing hormone, and meanwhile is regulated by ovarian estrogen (E2) feedback. Follicle-stimulating hormone plays a decisive role in the sexual and reproductive functions of men and women.

　　Through the measurement of follicle-stimulating hormone, we can understand the pituitary endocrine function, and indirectly understand the functional status of hypothalamus and ovary. This is helpful for differential diagnosis of pituitary or hypothalamic amenorrhea. Mainly promotes ovarian follicle development and maturation. In women, follicle-stimulating hormones stimulate follicle growth and maturation by acting directly on receptors on granulosa cells. Similar to luteinizing hormone (LH), high levels of follicle-stimulating hormone (FSH) indicate that the follicle is about to burst, and can predict ovulation and the diagnosis of ovulatory abnormalities, as well as the response to hyperovulatory drugs.