Abstract
In men, testosterone, the principal circulating androgen, has essential reproductive functions in establishing and maintaining the male phenotype. It also plays important anabolic roles in somatic tissues, such as muscle and bone. Organic hypogonadism resulting from structural hypothalamic-pituitary testicular (HPT) axis dysfunction is an important diagnosis not to be missed. It is an important differential to consider not only in the man presenting with low libido or infertility, but also with non-reproductive features such as otherwise unexplained weakness, anemia or osteoporosis. Hypogonadism is primarily a clinical diagnosis. Men who present with features suggestive of androgen deficiency should undergo a thorough history and physical examination to determine the degree of clinically significant androgen deficiency. Verification of the clinical impression by confirming low testosterone levels is an essential component of the diagnosis. Accordingly, the Endocrine Society recommends making a diagnosis of androgen deficiency only in men with consistent symptoms and signs as well as unequivocally and repeatedly low serum testosterone levels [1]. While the diagnosis is relatively straightforward in young otherwise healthy men, it considered more difficult in older, obese men with comorbidities. Even low libido, the most specific sexual symptoms can be caused by many other conditions such as vascular disease or depression, and the physical examination can be nonspecific. In the European Male Ageing Study, where the prevalence of sexual symptoms ranged from 27.5 % to 39.9 % in community-dwelling men, yet only 2.1 % met the definition of late onset hypogonadism, i.e. the syndromic combination of symptoms with low testosterone [2]. Given this non-specificity of clinical features in the absence of a biological gold standard of male hypogonadism akin to cessation of menses in females, accurate biochemical confirmation is important. This can be fraught with difficulties and pitfalls, and will be discussed in this chapter. This chapter will focus on testosterone measurements in adult men. Measurements of other reproductive steroids and further work-up of low testosterone is beyond the scope of this contribution.
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Grossmann, M. (2017). Utility and Limitations in Measuring Testosterone. In: Hohl, A. (eds) Testosterone. Springer, Cham. https://doi.org/10.1007/978-3-319-46086-4_4
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