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Influence on sCD40L Value According to ELISA Assay Kits.

Young Jin Kim, Ik Seong Choi, Seung Jae Kim

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    Soluble CD40 Ligand (sCD40L) levels vary significantly between ELISA kits, impacting its use as a biomarker. Standardized reference ranges and serum sample use are crucial for reliable sCD40L measurements.

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    Area of Science:

    • Biomarker Discovery
    • Immunology
    • Clinical Chemistry

    Background:

    • Soluble CD40 Ligand (sCD40L) is a potential biomarker for thrombotic risk and cancer progression.
    • Accurate sCD40L measurement is vital for research and clinical applications.
    • Standardization challenges arise from preanalytic variations, sample types, and differing ELISA kit reference ranges, affecting biobanking and reproducibility.

    Purpose of the Study:

    • To compare sCD40L measurements between two ELISA kits.
    • To establish reference ranges for sCD40L using Bayesian statistical methods.
    • To assess the impact of sample type (serum vs. plasma) on sCD40L levels.

    Main Methods:

    • sCD40L levels were quantified using two distinct ELISA kits.
    • Bayesian statistical analysis was employed to define reference ranges for each kit.
    • Paired t-tests and Pearson's correlation coefficients were used to compare kit results.

    Main Results:

    • Significant differences in sCD40L reference ranges were observed between the R&D kit (1,095.48 - 6,603.00 pg/mL) and the Invitrogen kit (1,620.00 - 10,405.00 pg/mL).
    • A statistically significant difference (p = 0.0019) was found between the kits.
    • A strong positive correlation (r = 0.88) was noted for sCD40L levels in serum samples.

    Conclusions:

    • ELISA kit selection significantly impacts sCD40L reference values, necessitating institution-specific ranges.
    • Serum is the preferred sample type over plasma for sCD40L analysis.
    • Standardized reference ranges are essential to enhance the reliability of sCD40L as a biomarker in research.