Development of Free Testosterone Chemiluminescence Detection Kit and Its Clinical Application

Area of Science:

• Biochemistry
• Clinical Chemistry
• Assay Development

Background:

• Free testosterone (FT) is the bioactive form of testosterone, directly entering cells and reflecting biological activity.
• Accurate FT measurement is vital for diagnosing conditions such as male hypogonadism, PCOS, and metabolic syndrome.
• Existing FT detection methods lack sensitivity, are complex, and costly, necessitating improved technologies.

Purpose of the Study:

• To develop and evaluate a novel chemiluminescence assay kit for the accurate quantification of free testosterone (FT).
• To assess the performance and clinical relevance of the developed FT assay.

Main Methods:

• A competitive immunoassay utilizing acridinium ester-labeled testosterone derivatives and magnetic beads was employed.
• Key assay parameters were optimized, and performance was evaluated for linearity, LoB, accuracy, precision, stability, and specificity.
• The assay was validated using 1615 male and 2035 female patient samples.

Main Results:

• The assay demonstrated excellent linearity (r > 0.99), low limit of blank (0.021 pg/mL), high accuracy (<5% deviation), and precision (CV <5%).
• Specificity was confirmed with no cross-reactivity, and the assay showed 12-month stability.
• Method comparison yielded a strong correlation (r = 0.9941), and patient sample analysis revealed significant FT differences across various diagnoses.

Conclusions:

• The developed chemiluminescence FT assay kit offers superior performance, cost-effectiveness, and high automation, meeting clinical requirements.
• FT measurement using this assay provides a valuable reference for diagnosing and assessing specific diseases, improving clinical management.