Über dich

Increasing adipose tissue increases insulin resistance, which negatively impacts the Leydig cells as well as inhibiting the release of luteinizing hormone (LH) via the release of adipokines (inflammatory cytokines) such as TNF-α. The estradiol negatively feeds back on the HPG system, reducing testosterone production in the Leydig cells. Adipose tissue contains high concentrations of aromatase, which reduces testosterone concentrations by converting it to estradiol. Thus, adiposity potentially leads to hypogonadism, which itself promotes further adiposity. The estradiol produced by aromatisation also provides negative feedback on the HPG axis, further reducing testosterone. Thus, the degree of hypogonadism is positively correlated to the degree of obesity in obese men (51,52). Utilising data from the NHANES III survey, it was found that men in the lowest free testosterone tertile were four times as likely to have diabetes as those in the highest free testosterone tertile (47).
It is recommended to perform a baseline digital rectal examinations (DRE) and a baseline PSA level measurement before starting testosterone therapy for any man, whatever his age (2,89). Although it is an effective oral androgen formulation, it is not recommended as a testosterone therapy for hypogonadism because of its hepatotoxic side effects and its association with long-term development of liver tumours. These are applied in the night and provide a good approximation of normal circadian plasma testosterone levels.
Large randomised trials using men with and without cardiovascular disease and with cardiovascular end-points are needed to better assess the consequences of testosterone treatment on cardiovascular risk (36). Human observational studies, however, have shown no associations between high testosterone levels and coronary artery disease, and testosterone has been shown to dilate the coronary arteries both in vitro and in vivo. In fact, the increased risk of cardiovascular disease in males compared with females has been taken to imply a role for testosterone (or oestrogen) in the disease. It is not yet understood whether the low testosterone levels are a consequence of the disease, are connected with the disease’s aetiology, or are one of the causes of the disease. As discussed below, a measurement of low testosterone in a patient should be reconfirmed at a later stage before considering treatment. A subject can have low testosterone levels, but can also have no clinically significant symptomatology.
Hypogonadism is a common condition in the male population, with a higher prevalence in older men, obese men, and men with type 2 diabetes. Cleveland Clinic’s experts can help balance your hormones. See a provider and discuss your options for treatment. If you have bothersome signs of low testosterone, avoid over-the-counter supplements.
For a primary care physician, it might be considered appropriate to refer a patient who requires further testosterone tests to an endocrinologist. Table 8 gives a list of conditions when SHBG levels may be higher or lower than normal. As testosterone is subject to circadian and circannual rhythms it is recommended to draw the blood sample in the morning. Most hospital laboratories can provide total testosterone measurements of good accuracy and reliability. Serum total testosterone is the easiest and most straightforward measurement to take for the first measurement. In our opinion, screening for at-risk patients is therefore worthy of consideration. Screening tools can be helpful in identifying patients with a high probability of having low testosterone.

Profil Information