Find out the normal FSH levels in women by age and phases of the menstrual cycle, how FSH affects fertility, and what to do if FSH levels are too high or low. This test measures the level of follicle-stimulating hormone (FSH) in your blood. FSH affects sexual development in children and fertility in adults. Learn more. An FSH and LH test is a simple blood draw that measures two hormones produced by your pituitary gland: follicle-stimulating hormone (FSH) and luteinizing hormone (LH). FSH (follicle-stimulating hormone) is a pituitary hormone that drives egg and sperm production. A single FSH value is most useful when paired with estradiol, LH, and AMH. Understand your follicle-stimulating hormone levels with our 2026 range chart. Learn what numbers mean for fertility, perimenopause, and wellbeing Follicle-stimulating hormone (FSH) is crucial for both men's and women's reproductive health and can be measured with a blood test. High FSH levels can indicate that your body is having difficulty producing quality eggs or sperm. FSH is a hormone that plays a role in reproduction. Find out how FSH tests work, what they indicate, and the next steps to take after testing. Follicle-stimulating hormone (FSH) is produced by the pituitary gland, a pea-sized structure at the base of your brain, and it plays a central role in fertility for both men and women. FSH is synthesized and secreted by the gonadotropic cells of the anterior pituitary gland [2] and regulates the development, growth, pubertal maturation, and reproductive processes of the body. FSH and luteinizing hormone (LH) work together in the reproductive system. [3] What is follicle-stimulating hormone (FSH)? Follicle-stimulating hormone (FSH) is a hormone your pituitary gland makes and releases that plays a role in sexual development and reproduction. It affects the function of ovaries and testicles.