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A nephelometry system for the Abbott TDx analyzer.

R F DeGrella, G L Combs, E E Coffee

    Clinical Chemistry
    |September 1, 1985
    PubMed
    Summary
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    A new light-scattering accessory enables the Abbott TDx analyzer to perform nephelometric assays for specific proteins like IgG and IgA. This innovation expands the analyzer

    Area of Science:

    • Biochemistry
    • Analytical Chemistry
    • Immunology

    Background:

    • The Abbott TDx analyzer is a fluorescence polarization analyzer.
    • Nephelometric methods are crucial for quantifying specific proteins in biological samples.
    • Existing analytical methods may have limitations in terms of throughput or sample preparation.

    Purpose of the Study:

    • To develop a light-scattering accessory for the Abbott TDx analyzer.
    • To extend the TDx analyzer's capabilities to nephelometric assays.
    • To enable the quantification of specific proteins and monitoring of chromogenic reactions.

    Main Methods:

    • A self-contained light-scattering accessory carousel was developed for the Abbott TDx.
    • Scattered light was measured at 37.5 degrees using a green-light-emitting diode (565 nm).

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  • Measurements were performed at quasi-equilibrium with sample blank correction and automatic antigen-excess checks.

    • Main Results:

    • The accessory successfully extended the TDx analyzer to nephelometric methods.
    • Assays for specific proteins (IgG, IgA, IgM, transferrin) were performed with good precision (CVs 3-6% within-run, 7-9% total).
    • A novel nephelometric method, Scattered Energy Attenuation (SEA), was described and applied to measure calcium, total protein, iron, and bilirubin.

    Conclusions:

    • The developed light-scattering accessory enhances the Abbott TDx analyzer's versatility for clinical diagnostics.
    • Nephelometric assays for specific proteins can be reliably performed on the modified TDx.
    • The SEA method shows promise for monitoring various biochemical analytes.