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Related Experiment Videos

Serum bioavailable testosterone: assayed or calculated?

Frank Giton1, Jean Fiet, Jérôme Guéchot

  • 1Emi INSERM 03-37, Centre de Recherches Chirurgicales, CHU Henri Mondor, Faculté de Médecine, Créteil, France.

Clinical Chemistry
|December 31, 2005
PubMed
Summary
This summary is machine-generated.

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Accurate bioavailable testosterone (BT) measurement requires using optimal association constants for calculation, not theoretical ones. The ammonium sulfate precipitation method is recommended for reliable BT determination due to calculation uncertainties.

Area of Science:

  • Endocrinology
  • Clinical Chemistry
  • Andrology

Background:

  • Bioavailable testosterone (BT) is the unbound circulating testosterone fraction.
  • BT is believed to readily enter cells.
  • Accurate measurement of BT is crucial for clinical assessment.

Purpose of the Study:

  • To compare bioavailable testosterone (BT) measurements obtained through direct assay versus calculation methods.
  • To evaluate the impact of different testosterone association constants on calculated BT (CBT) values.
  • To determine the most reliable method for BT quantification in hypogonadal and healthy men.

Main Methods:

  • Sera from hypogonadal and healthy men were analyzed.
  • Ammonium sulfate precipitation was used to separate SHBG-bound testosterone.

Related Experiment Videos

  • Bioavailable testosterone was assayed (ABT) and calculated (CBT) using theoretical and optimized association constants.

    • Main Results:

    • CBT calculated with theoretical constants showed significant differences (>30%) from ABT in most samples.
    • CBT calculated using optimized paired association constants closely approximated ABT values (differing by <30% in up to 97.5% of samples).
    • Mean CBT/ABT ratios approached 1.0 when using optimized constants, indicating good agreement.

    Conclusions:

    • Optimal paired association constants, specific to the studied population, are necessary for accurate calculated BT (CBT).
    • Theoretical association constants lead to substantial inaccuracies in CBT.
    • The ammonium sulfate precipitation method is advised for reliable BT measurement due to the inherent uncertainties in calculation methods.