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Related Experiment Videos

Newborn screening for hemoglobin abnormalities. A comparison of methods.

S Jacobs, L Peterson, L Thompson

    American Journal of Clinical Pathology
    |June 1, 1986
    PubMed
    Summary

    Isoelectric focusing (IEF) is more sensitive for detecting hemoglobin variants in newborns than traditional electrophoresis. However, its routine use for newborn screening requires further evaluation to justify the increased sensitivity for hemoglobin analysis.

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    Area of Science:

    • Clinical Chemistry
    • Genetics
    • Newborn Screening

    Background:

    • Hemoglobin variants are common in populations of Black and Southeast Asian ancestry.
    • Accurate and sensitive detection of hemoglobinopathies in newborns is crucial for early diagnosis and management.
    • Established electrophoresis methods like cellulose acetate (CAC) and citrate agar (CAG) are widely used for hemoglobin analysis.

    Purpose of the Study:

    • To compare the diagnostic performance of isoelectric focusing (IEF) with combined CAC and CAG electrophoresis for detecting hemoglobin variants in a newborn population.
    • To assess the sensitivity of IEF in identifying low-level hemoglobin variants that may be missed by conventional electrophoresis.

    Main Methods:

    • Screening of peripheral blood from 1,000 newborns (641 Black, 359 Southeast Asian) for hemoglobin variants.

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  • Comparative analysis of results obtained from cellulose acetate (CAC) and citrate agar (CAG) electrophoresis versus isoelectric focusing (IEF) electrophoresis.

    • Main Results:

    • Complete agreement was observed between IEF and CAC/CAG for Hb S trait, Hb C trait, Hb E trait, and homozygous Hb E.
    • IEF detected small amounts of Hb A in two cases of Hb S-beta+ thalassemia, which were indistinguishable from sickle cell anemia by CAC/CAG.
    • IEF identified 120 cases of Hb Bart's, while CAC detected only 51 of these cases, indicating higher sensitivity for IEF.

    Conclusions:

    • Isoelectric focusing (IEF) demonstrates superior sensitivity in detecting certain hemoglobin variants, including low-level Hb A in Hb S-beta+ thalassemia and Hb Bart's.
    • While IEF offers improved detection capabilities, its clinical utility and cost-effectiveness for routine newborn hemoglobin screening warrant further investigation.
    • The enhanced sensitivity of IEF may aid in differentiating complex hemoglobinopathies that present similarly on conventional electrophoresis.