Enzyme immunoassay of serum testosterone

Area of Science:

• Endocrinology
• Biochemistry
• Assay Development

Background:

• Accurate measurement of serum testosterone is crucial for diagnosing various endocrine disorders.
• Existing testosterone assays may have limitations in sensitivity, precision, or applicability to different sample types.

Purpose of the Study:

• To describe and validate a novel enzyme immunoassay for serum testosterone quantification.
• To assess the performance characteristics of the developed assay, including accuracy, precision, and sensitivity.

Main Methods:

• Serum testosterone was measured using an enzyme immunoassay employing a testosterone-glucoamylase complex.
• Extraction with hexan:ether (4:1) was performed for male serum samples.
• An additional thin-layer chromatography step was incorporated for female serum samples.

Main Results:

• The assay demonstrated good precision, with within-assay and between-assay coefficients of variation of 11.1% and 12.0%, respectively.
• The sensitivity of the assay was determined to be 0.25 ng.
• Mean testosterone levels in normal men (5.3 +/- 1.8 ng/ml) and cycling women (0.52 +/- 0.12 ng/ml) were reported.

Conclusions:

• The developed enzyme immunoassay provides a reliable and sensitive method for serum testosterone estimation.
• The assay's performance favorably compares with established testosterone measurement techniques.
• This method is suitable for quantifying testosterone in both male and female serum samples.