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Plasmatic testosterone values in 105 Klinefelters.

J Raboch, J Neuwirth, L Starka

    Andrologia
    |January 1, 1975
    PubMed
    Summary
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    Men with Klinefelter's syndrome have significantly lower testosterone levels compared to fertile men. Unlike in fertile men, testosterone levels in Klinefelter's syndrome patients did not decline with age.

    Area of Science:

    • Endocrinology
    • Human Genetics
    • Reproductive Medicine

    Background:

    • Klinefelter syndrome (47,XXY) is a common genetic condition affecting males.
    • Hormonal imbalances, particularly low testosterone, are characteristic of Klinefelter syndrome.
    • Age-related changes in testosterone levels are well-documented in the general male population.

    Purpose of the Study:

    • To investigate testosterone levels in patients with Klinefelter syndrome.
    • To compare testosterone levels and age-related dynamics between Klinefelter syndrome patients and fertile men.
    • To examine phenotypic and laboratory findings across different chromosomal variants of Klinefelter syndrome.

    Main Methods:

    • Clinical, spermiologic, and karyologic examinations were conducted.

    Related Experiment Videos

  • Plasmatic testosterone levels were measured in 105 patients with Klinefelter syndrome (ages 16-45) and 108 controls (ages 21-55).
  • Statistical analysis compared hormonal levels and age-related changes between groups.

    • Main Results:

    • Patients with Klinefelter syndrome exhibited significantly lower blood testosterone levels than controls.
    • Testosterone levels in fertile men showed age-dependency, but this was not observed in Klinefelter syndrome patients (ages 21-45).
    • The 46,XY/47,XXY mosaic variant of Klinefelter syndrome displayed the least phenotypic and laboratory changes.

    Conclusions:

    • Klinefelter syndrome is associated with significantly reduced testosterone levels.
    • Age does not appear to dynamically affect testosterone levels in men with Klinefelter syndrome between ages 21 and 45.
    • Mosaic chromosomal variants, such as 46,XY/47,XXY, may present with milder clinical manifestations in Klinefelter syndrome.