DESIGN OF IMMUNORADIOMETRIC ASSAY FOR GONADOTROPINS USING A COMMON DETECTION ANTIBODY: AN EXPERIENCE

Area of Science:

• Biochemistry
• Immunology
• Endocrinology

Background:

• Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH) are critical gonadotropins regulating reproductive functions.
• Accurate measurement of FSH and LH is essential for diagnosing various endocrine and reproductive disorders.
• Existing assay methods may have limitations in sensitivity, precision, or cross-reactivity.

Purpose of the Study:

• To develop and validate a novel immunoradiometric assay (IRMA) for simultaneous measurement of FSH and LH.
• To utilize a common tracer strategy for enhanced assay efficiency.
• To establish the clinical utility of the developed assay through rigorous validation.

Main Methods:

• Development of a common tracer by radiolabeling a monoclonal antibody against a common epitope of FSH and LH.
• Chemical immobilization of epitope-specific monoclonal antibodies against the β-subunit of FSH and LH as the capture system.
• Optimization of an inclusive assay procedure involving incubation of standards/samples with the capture antibody and common tracer.

Main Results:

• The developed IRMA achieved a sensitivity of 1.0 mIU/ml for both FSH and LH.
• Assay precision was acceptable, with an imprecision coefficient of variation (CV) ≤ 10%.
• Minimal cross-reactivity was observed, indicating assay specificity.

Conclusions:

• The developed common tracer-based IRMA for FSH and LH is a clinically useful assay.
• The assay offers adequate sensitivity, acceptable precision, and minimal cross-reactivity.
• This method provides a reliable tool for accurate gonadotropin measurement in clinical settings.