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Serum testosterone measurements.

W J Boyle, A A Compton, G Rigg

    American Journal of Clinical Pathology
    |June 1, 1984
    PubMed
    Summary
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    Measuring apparent free testosterone improves clinical correlations for diagnosing androgen excess or deficiency. This method offers better insights than total testosterone levels in various patient populations.

    Area of Science:

    • Endocrinology
    • Clinical Chemistry

    Background:

    • Serum testosterone levels are crucial for assessing androgen status.
    • Evaluating androgen excess or deficiency often involves measuring total and free testosterone.
    • Existing methods for measuring free testosterone may have limitations.

    Purpose of the Study:

    • To compare apparent free testosterone concentration with total serum testosterone concentration.
    • To evaluate the clinical utility of apparent free testosterone in diverse populations.
    • To assess the impact of different radioimmunoassay (RIA) kits on testosterone measurements.

    Main Methods:

    • Serum samples were equilibrated with 14C-labeled testosterone.
    • Ammonium sulfate precipitation was used to determine apparent free testosterone.

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  • Total serum testosterone was measured using five different commercial RIA kits.
  • Populations studied included normal males and females, females with gynecologic issues (hirsutism/virilization), and patients on hemodialysis.

    • Main Results:

    • Apparent free testosterone concentrations showed improved clinical correlations compared to total testosterone.
    • Variations in RIA kit methodologies did not significantly alter the observed correlations.
    • The utility of apparent free testosterone was demonstrated across different clinical groups.

    Conclusions:

    • Apparent free testosterone concentration is a more clinically relevant parameter than total testosterone for evaluating androgen status.
    • This method enhances diagnostic accuracy in conditions of androgen excess or deficiency.
    • The findings support the use of apparent free testosterone measurements in clinical practice.