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  2. What Free Testosterone Is, and Why it Matters - AOL

    www.aol.com/free-testosterone-why-matters...

    But when considering calculated free testosterone, luteinizing hormones, and sex hormone-binding globulin levels, up to 20.2 percent of men would qualify as having subsets of the condition, like ...

  3. What Is Low Testosterone & What Causes It? - AOL

    www.aol.com/low-testosterone-causes-125700734.html

    Testosterone levels increase in adolescence after puberty and into early adulthood, and naturally decline over time, usually starting in a man’s 40s or fifties. However, this drop now seems to ...

  4. Hypogonadism - Wikipedia

    en.wikipedia.org/wiki/Hypogonadism

    In particular, research has questioned the validity of commonly administered assays of free testosterone by radioimmunoassay. [16] The free androgen index, essentially a calculation based on total testosterone and sex hormone-binding globulin levels, has been found to be the worst predictor of free testosterone levels and should not be used. [17]

  5. 11 science-backed ways to naturally increase testosterone - AOL

    www.aol.com/11-science-backed-ways-naturally...

    The herb's T-boosting ability may lie in boosting free testosterone levels. Testosterone is metabolized through two different processes. In the first, an enzyme called 5-alpha reductase converts ...

  6. Testicular atrophy - Wikipedia

    en.wikipedia.org/wiki/Testicular_atrophy

    Low testosterone is a potential cause of testicular atrophy, and laboratory values of blood samples can confirm low free or bioavailable testosterone. [ 25 ] Due to the high levels of oxidative stress in the semen, there may also be higher levels of sperm DNA fragmentation for people with varicoceles.

  7. Free androgen index - Wikipedia

    en.wikipedia.org/wiki/Free_androgen_index

    The free androgen index is intended to give a guide to the free testosterone level, but it is not very accurate (especially in males — see endocrine society commentary below). Consequently, there are no universally agreed 'normal ranges', and levels slightly above or below quoted laboratory reference ranges may not be clinically significant.

  8. What are normal testosterone levels by age? - AOL

    www.aol.com/news/normal-testosterone-levels-age...

    Testosterone is an important hormone. It helps men develop during puberty, and as they age, it plays a critical role in helping control fat levels, cholesterol, and glucose levels.

  9. Pharmacokinetics of testosterone - Wikipedia

    en.wikipedia.org/wiki/Pharmacokinetics_of...

    In women with polycystic ovary syndrome (PCOS), a condition of androgen excess, testosterone levels are typically around 50 to 80 ng/dL, with a range of about 30 to 140 ng/dL. [9] [10] [7] Total testosterone levels are about 20-fold and free testosterone levels about 40-fold higher in men than in women on average. [11]