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Related Concept Videos

Instrument Calibration01:12

Instrument Calibration

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Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
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Accuracy and Precision01:52

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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.  Highly accurate...
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Method validation is a crucial process in analytical chemistry designed to confirm that a given method consistently produces reliable and high-quality results. This process is essential when a method is applied to different sample matrices or when procedural modifications are made, ensuring that the results meet acceptable standards across various applications.
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Chemical Shift: Internal References and Solvent Effects01:17

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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Quality control is one of the three cyclical quality assurance activities that help keep a system under statistical control. Typical quality control activities include creating quality control charts, conducting proficiency testing, and documenting and archiving results.
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In the case of systematic errors, the sources can be identified, and the errors can be subsequently minimized by addressing these sources. According to the source, systematic errors can be divided into sampling, instrumental, methodological, and personal errors.
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Performance criteria for reference measurement procedures and reference materials.

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    Ensuring measurement result equivalence in clinical settings requires metrological traceability. This involves sequential calibrations, reference materials, and validated procedures to meet international standards for in vitro diagnostic devices.

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    Area of Science:

    • Clinical chemistry
    • Metrology
    • In vitro diagnostics

    Background:

    • Metrological traceability is crucial for reliable clinical measurements.
    • Equivalence of measurement results across different users and time is a key goal.
    • International standards guide calibration, reference materials, and procedures.

    Purpose of the Study:

    • To explain the importance of metrological traceability in clinical measurements.
    • To outline the conditions and requirements for achieving measurement result equivalence.
    • To emphasize the role of standards in ensuring the performance of in vitro diagnostic devices.

    Main Methods:

    • Sequential calibrations using reference materials and procedures.
    • Implementation of calibration hierarchies.
    • Control and elimination of measurement uncertainty and systematic bias.

    Main Results:

    • Achieving measurement result equivalence within defined uncertainties.
    • Meeting analytical performance requirements for in vitro diagnostic devices.
    • Ensuring end-user measurement procedures perform acceptably.

    Conclusions:

    • Correct implementation of calibration hierarchies and adherence to international standards are essential.
    • Continuous improvement of methods, reference materials, and calibrators is necessary.
    • Metrological traceability is fundamental for accurate and comparable clinical measurements.