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Related Experiment Videos

A simplified assay for serum 25-hydroxycalciferol.

E E Delvin, M Dussault, F H Glorieux

    Clinical Biochemistry
    |June 1, 1980
    PubMed
    Summary

    This study developed a reliable assay to measure serum 25-hydroxyvitamin D (25-OH D), a key indicator of vitamin D status. The new method uses alpha-globulin for accurate and sensitive vitamin D level assessment in children.

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    Area of Science:

    • Biochemistry
    • Clinical Chemistry
    • Nutritional Science

    Background:

    • Serum 25-hydroxyvitamin D (25-OH D) is a reliable indicator of vitamin D nutritional status.
    • Vitamin D transport to the kidney involves binding to alpha-globulins.
    • Assessing 25-OH D levels is crucial for monitoring vitamin D status.

    Purpose of the Study:

    • To develop a competitive binding assay for measuring serum 25-hydroxyvitamin D (25-OH D).
    • To utilize an alpha-globulin enriched fraction as the ligand protein in the assay.
    • To establish a sensitive and reliable method for assessing vitamin D status.

    Main Methods:

    • Developed a competitive binding assay using Cohn's fraction IV (alpha-globulin enriched).
    • Assessed assay sensitivity with a detection limit of 0.1 ng 25-OHD/tube.
    • Evaluated assay precision with intra-assay (8.9%) and inter-assay (8.4%) variations.

    Main Results:

    • Achieved a low detection limit of 0.1 ng 25-OHD/tube.
    • Demonstrated low non-specific binding (<3% of initial binding).
    • Established reference values in children (50.5 +/- 21.5 nmol/l).

    Conclusions:

    • The developed assay is a reliable and sensitive tool for assessing serum 25-OH D levels.
    • This method can accurately evaluate vitamin D nutritional status.
    • The assay provides valuable data for clinical and research applications in vitamin D assessment.

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