However, concerns regarding the effect of testosterone on the prostate, in particular any possible effect on the risk of prostate cancer have prompted further research in this regard. The symptoms you experience will depend entirely on the root cause and whether it results in low levels of estrogen or testosterone. Unlike the cyclical surge seen in women, LH secretion in men is typically steady, operating on a negative feedback loop to maintain stable testosterone levels. This testosterone is then responsible for sperm production (spermatogenesis), libido, and the maintenance of male secondary sexual characteristics. Table 3.6 summarises the clinical and biochemical parameters that should be monitored during testosterone therapy. Testosterone therapy alleviates symptoms and signs of hypogonadism in men in a specific time-dependent manner. During puberty, KS subjects show less muscle mass, less facial and body hair, and broader hips as a consequence of low levels of testosterone. The syndrome is defined by the presence of at least one extra X chromosome in addition to a Y chromosome, yielding a total of 47 or more chromosomes rather than the usual 46. They named the hormone testosterone, from the stems of testicle and sterol, and the suffix of ketone. 5α-Reductase is highly expressed in the male reproductive organs (including the prostate gland, seminal vesicles, and epididymides), skin, hair follicles, and brain and aromatase is highly expressed in adipose tissue, bone, and the brain. Approximately 5 to 7% of testosterone is converted by 5α-reductase into 5α-DHT, with circulating levels of 5α-DHT about 10% of those of testosterone, and approximately 0.3% of testosterone is converted into estradiol by aromatase. The amount of testosterone synthesized is regulated by the hypothalamic–pituitary–testicular axis (Figure 2). The prevalence of LOH increases with age, with the major causes being obesity, other comorbidities (e.g. diabetes) and overall poor health . Cleveland Clinic’s experts can help balance your hormones. See a provider and discuss your options for treatment. If you’re concerned about your health or testosterone levels, it’s best to talk to a healthcare provider. High testosterone levels could indicate a tumor in your adrenal glands or testicles. Laboratories may have different reference ranges for normal testosterone levels. A testosterone test is a blood test that measures your levels of testosterone, a hormone. Abnormal testosterone levels can point to several different health issues. Interpreting FSH and LH levels is not about looking at each number in isolation but rather analyzing them in relation to each other and to testosterone levels. Similarly, in human patients with primary hypogonadism, testosterone replacement allows the development of normal prostatic growth and BPH.5 It is also well-known that in men with diseases of the prostate (such as prostate cancer or BPH), castration or androgen deprivation treatments leads to decrease prostate size and improvement in urinary function in some patients.6 As testosterone levels slowly decrease, the pituitary gland may increase LH production to compensate. The decision to stop testosterone therapy or to perform prostate biopsy due to PSA increase or prostate abnormalities should be based on local PCa guidelines.
