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Related Experiment Videos

Liquid and lyophilized quality-control materials compared for use in continuous-flow analysis.

R J Elin, B A Gray

    Clinical Chemistry
    |January 1, 1984
    PubMed
    Summary

    Liquid quality-control materials may introduce greater variability in laboratory testing compared to lyophilized options. Higher viscosity in liquid controls can significantly impact the precision of diagnostic assays, affecting patient results.

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    Area of Science:

    • Clinical chemistry
    • Laboratory diagnostics
    • Quality control in healthcare

    Background:

    • Accurate laboratory testing relies on high-quality control materials.
    • Continuous-flow instruments are widely used for automated analysis.

    Purpose of the Study:

    • To compare the performance of a liquid quality-control material with lyophilized alternatives.
    • To identify potential sources of imprecision in laboratory diagnostics.

    Main Methods:

    • Comparison of a liquid control (Decision level 3) with two lyophilized controls (Ortho Abnormal, Omega II) using a Technicon SMAC instrument.
    • Analysis of variances for 19 analytes.
    • Assessment of viscosity and potential for incomplete mixing or carryover.

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    Main Results:

    • The liquid control exhibited significantly greater variances for 19 analytes compared to both lyophilized controls (p < 0.00001).
    • Imprecision was not attributed to incomplete mixing or carryover.
    • The liquid control's viscosity was more than double that of lyophilized controls and pooled human serum.

    Conclusions:

    • Liquid quality-control materials can introduce significant imprecision in continuous-flow analysis.
    • Elevated viscosity of liquid controls is a likely contributor to assay variability.
    • Lyophilized control sera demonstrate superior performance for routine laboratory quality control.