Primary hypogonadism (congenital or acquired): Testicular failure due to diseases and conditions in the body such as cryptorchidism, bilateral torsion, orchitis, vanishing testis syndrome, orchiectomy, Klinefelter Syndrome, chemotherapy, or toxic damage from alcohol or heavy metals; these men usually have low serum testosterone levels and gonadotropins (FSH, LH) above normal range Hypogonadotropic hypogonadism (congenital or acquired): Gonadotropin or luteinizing hormone-releasing hormone (LHRH) deficiency or pituitary-hypothalamic injury from tumors, trauma, or radiation; these men have low testosterone serum concentrations but have gonadotropins in the normal or low range.
NOTE: One interesting fact about erythropoitin is that it is also called EPO, a name that may be more familiar to some of you. Yes, that should bring the name Lance Armstrong to mind. Lance Armstrong confessed to using EPO as a performance enhancing drug strictly for the purpose of raising his red blood cell counts for racing purposes. Basically, he was doing a different and very dangerous kind of steroid. Giving EPO to these racers leaves them vulnerable to dieing in their sleep from the "sludging" of the blood that occurs. It does turn them into superhumans however.