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  2. 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]

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

    www.aol.com/lifestyle/low-testosterone-causes...

    What Are Normal Testosterone Levels? The standard range for normal testosterone (eugonadal) levels in men is 300 to 1,000 nanograms per deciliter (ng/dL). But it’s totally normal for your ...

  4. 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 ...

  5. 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.

  6. Why testosterone matters for longevity - AOL

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

    Testosterone is a critical hormone for men, and clinically low levels are associated with medical problems that reduce your health span and life span, including diabetes, metabolic syndrome ...

  7. 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.

  8. 7 testosterone myths debunked - AOL

    www.aol.com/7-testosterone-myths-debunked...

    One of testosterone's primary jobs is to regulate your sexual desire. Researchers are clear on the exact mechanics, but low libido is one of the most common symptoms of low levels of testosterone ...

  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]