Is a quantification of follicle stimulating hormone. ollicle-stimulating hormone (FSH) is a hormone found in humans and other animals. It is synthesized and secreted by gonadotrophs of the anterior pituitary gland. FSH regulates the development, growth, pubertal maturation, and reproductive processes of the body. FSH and luteinizing hormone (LH) act synergistically in reproduction. Specifically, an increase in FSH secretion by the anterior pituitary causes ovulation. FSH measurements are used as a biomarker of oocyte reserve. The trait is EFO_0004768 (follicle stimulating hormone measurement). Also known as: FSH level, FSH levels, follicle stimulating hormone level, follicle stimulating hormone levels.