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Microchromatographic methods for hemoglobin A2 quantitation compared

E M Brosious, J M Wright, R M Baine

    Clinical Chemistry
    |December 1, 1978
    PubMed
    Summary
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    Four microchromatographic methods for determining hemoglobin A2 (Hb A2) were compared. Two commercial kits and the Efremov procedure showed similar precision, while the Huisman technique demonstrated less reliable results for Hb A2 analysis.

    Area of Science:

    • Clinical Chemistry
    • Hematology

    Background:

    • Accurate quantification of Hemoglobin A2 (Hb A2) is crucial for diagnosing and managing beta-thalassemia trait.
    • Microchromatography is a common technique for Hb A2 analysis, but method variability can impact diagnostic accuracy.

    Purpose of the Study:

    • To compare the precision and reliability of four different microchromatographic methods for Hb A2 determination.
    • To evaluate the performance of two commercial Hb A2 test kits against established laboratory procedures.

    Main Methods:

    • Four microchromatographic methods were employed over 20 workdays.
    • Methods included the Efremov procedure (Tris/HCl buffer), Huisman technique (glycine developer), and two commercial kits (modified glycine developer).
    • Blood samples from 12 normal adults and 12 beta-thalassemia carriers were analyzed.

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    Main Results:

    • The Efremov procedure and two commercial kits demonstrated comparable precision for both normal and beta-thalassemia trait samples.
    • The Huisman technique exhibited higher coefficients of variation, indicating lower precision.
    • The Huisman technique was the only method where results overlapped between normal and elevated Hb A2 concentrations, compromising diagnostic clarity.

    Conclusions:

    • The Efremov procedure and the two commercial kits offer reliable and precise Hb A2 measurements.
    • The Huisman technique using glycine developer is less precise and may lead to diagnostic ambiguity in Hb A2 analysis.