Male hypogonadism is a clinical syndrome resulting from a failure of the testes to produce physiological levels of testosterone (androgen deficiency), sperm, or both, because of disruption of one or more levels of the hypothalamic-pituitary-gonadal axis.1,2
Male hypogonadism is characterized by a deficiency of endogenous testosterone production resulting in abnormally low levels of circulating testosterone. Hypogonadism can be caused by a number of disorders, the most frequently observed being idiopathic hypogonadotrophic hypogonadism, hypopituitarism, Klinefelter’s syndrome, and late-onset hypogonadism.
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1 Bhasin S, Cunningham GR, Hayes FJ, Matsumoto AM, Snyder PJ, Swerdloff RS, Montori VM; Task Force, Endocrine Society. Testosterone therapy in men with androgen deficiency syndromes: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2010 Jun;95(6):2536-59.
doi: 10.1210/jc.2009-2354. Review.
2 ISA, ISSAM, EAU, EAA and ASA recommendations: investigation, treatment and monitoring of late-onset hypogonadism in males. Wang C, Nieschlag E, Swerdloff RS, Behre H, Hellstrom WJ, Gooren LJ, Kaufman JM, Legros JJ, Lunenfeld B, Morales A, Morley JE, Schulman C, Thompson IM, Weidner W, Wu FC. Aging Male. 2009 Mar;12(1):5-12. doi: 10.1080/13685530802389628