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Related Experiment Video

Updated: Apr 15, 2026

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How to define a significant deviation from the expected internal quality control result.

Ferruccio Ceriotti, Duilio Brugnoni, Sonia Mattioli

    Clinical Chemistry and Laboratory Medicine
    |April 15, 2015
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    Summary
    This summary is machine-generated.

    Internal quality control (IQC) can be improved using measurement uncertainty. This approach provides an immediate alarm system by comparing uncertainty to quality goals, ensuring reliable laboratory results.

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    Area of Science:

    • Clinical Chemistry
    • Laboratory Medicine
    • Quality Management

    Background:

    • Internal quality control (IQC) is essential for laboratory diagnostics.
    • Effective IQC requires defined quality goals and an efficient alarm system.
    • The uncertainty approach offers a novel method for developing IQC alarm systems.

    Purpose of the Study:

    • To propose and evaluate the uncertainty approach for an effective internal quality control alarm system.
    • To demonstrate the application of uncertainty calculations in verifying conformity to quality goals.
    • To present a simplified data interpretation method for IQC.

    Main Methods:

    • Utilized a top-down approach to calculate measurement uncertainty.
    • Compared the calculated expanded uncertainty with maximum permissible error (quality goals).
    • Developed an 'acceptance zone' based on quality goals and expanded uncertainty for visual assessment.

    Main Results:

    • The relationship between quality goals and expanded uncertainty determines the attainability of quality objectives.
    • An expanded uncertainty equal to or exceeding the quality goal indicates the goal is not achievable.
    • The approach was successfully applied to glucose and creatinine measurements.

    Conclusions:

    • The uncertainty approach leverages existing data (expanded uncertainty) required for ISO 15189 accreditation.
    • This method provides immediate and easily interpretable data for comparing method performance against quality goals.
    • The proposed system enhances the effectiveness of internal quality control in clinical laboratories.