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Sequential competitive enzyme immunoassay for human chorionic gonadotropin

S Tomoda, K Hamada, T Sugawa

    Endocrinologia Japonica
    |December 1, 1980
    PubMed
    Summary
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    A new sequential competitive enzyme immunoassay for human chorionic gonadotropin (hCG) was developed. This method overcomes serum interference and improves solid-phase stability, offering reliable hCG quantification for clinical diagnostics.

    Area of Science:

    • Biochemistry
    • Immunology
    • Clinical Chemistry

    Background:

    • Previous simultaneous competitive enzyme immunoassay for hCG faced challenges with serum interference.
    • Sheep red blood cells used as a solid phase in the prior method were prone to washing away during the procedure.

    Purpose of the Study:

    • To develop a sequential competitive enzyme immunoassay for human chorionic gonadotropin (hCG).
    • To address and eliminate serum interference encountered in previous immunoassay methods.
    • To enhance solid-phase stability by utilizing silicone rods.

    Main Methods:

    • Development of a sequential competitive enzyme immunoassay technique.
    • Utilized silicone rods as the solid phase for improved stability.
    • Validated the assay's working range and compared results with Radioimmunoassay (RIA).

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    Main Results:

    • The sequential method effectively removed serum interference.
    • The assay demonstrated a working range of 0.5 mIU/ml to 200 mIU/ml for serum hCG.
    • Serum hCG values obtained correlated well with RIA (n=0.904).
    • Satisfactory coefficients of variation were achieved (14.2% within-assay, 15.2% between-assay).

    Conclusions:

    • The sequential competitive enzyme immunoassay is a robust method for quantifying serum hCG.
    • This improved assay overcomes limitations of previous methods, offering enhanced reliability and accuracy.
    • The method is suitable for clinical applications requiring precise hCG measurement.