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Related Experiment Videos

Quantitation of hemoglobin A2. An interlaboratory study.

R M Schmidt, E M Brosious

    American Journal of Clinical Pathology
    |May 1, 1979
    PubMed
    Summary
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    Proficiency testing revealed significant variability in hemoglobin A2 quantitation methods. Many labs struggled to accurately differentiate normal blood from beta-thalassemia trait samples, highlighting a need for standardization.

    Area of Science:

    • Hematology
    • Clinical Chemistry

    Background:

    • Hemoglobinopathies, such as beta-thalassemia trait, require accurate quantification of hemoglobin A2 (Hb A2) for diagnosis.
    • Proficiency testing is crucial for assessing laboratory performance in diagnostic assays.

    Purpose of the Study:

    • To evaluate the accuracy and precision of Hb A2 quantitation methods used in clinical laboratories.
    • To assess the ability of laboratories to distinguish between normal Hb A2 levels and elevated levels characteristic of beta-thalassemia trait.

    Main Methods:

    • A 1976 proficiency testing survey by the CDC involved distributing whole-blood samples to 183 volunteer laboratories.
    • Results from participant laboratories were compared against 24 reference laboratories using various Hb A2 quantitation techniques.

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    Main Results:

    • Significant inter-laboratory and inter-method variability was observed in Hb A2 quantitation for both normal and elevated samples.
    • Many laboratories failed to achieve results within 2 standard deviations of the reference mean.
    • A substantial number of participants could not accurately differentiate normal blood from samples with beta-thalassemia trait.

    Conclusions:

    • Current methods for Hb A2 quantitation exhibited poor accuracy and precision, impacting diagnostic capabilities.
    • There is a critical need for standardized Hb A2 measurement techniques and reliable methods for assessing laboratory performance in this assay.