FSH is a hormone that regulates reproductive function in both males and females. Learn about FSH functions, levels, test, and conditions that affect FSH levels. Learn about the FSH Test, its purpose, uses, normal values, test results interpretation, and more for a better understanding of your health. What is the FSH test? The FSH test is mainly used to measure the level of follicle-stimulating hormone ( FSH ) in a blood sample. Why is the FSH test used? This test is mainly used to diagnose the causes of infertility and the procedure is carried out in both a man and a woman. Other uses of this test include: Amenorrhea. Ovarian failure. FSH Full Form : Definition, History, and Benefits Explained Understanding the Role and Impact of Follicle-Stimulating Hormone in Reproductive Health.