What is a Follicle-stimulating Hormone (FSH) test?
FSH is a gonadotropin hormone secreted by a small gland (pituitary gland) situated in the brain. It plays an important role in role in sexual development during puberty, including the production of sperms in males and ovarian follicles in females. The levels of this hormone are low in children, and they rise at puberty (near the ages of 10-14 years).
In men, FSH remains constant throughout life. However, in women, its levels vary from time to time, according to their menstrual cycle. As ovaries stop functioning at menopause, blood FSH levels rise steeply in perimenopausal women.
Thus, the levels of FSH in blood and urine can help determine if a woman is going through menopause or perimenopause.