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Evaluation of a simplified microchromatographic technique for hemoglobin A2 determination
Acta Haematologica
|January 1, 1979
Summary
A simplified microchromatography method for Hemoglobin A2 (Hb A2) determination shows potential for routine use and screening. While generally correlating with electrophoresis, it exhibits higher variability and potential over/underestimation, especially with commercial kits.
Area of Science:
- Clinical Chemistry
- Hematology
- Analytical Biochemistry
Background:
- Accurate Hemoglobin A2 (Hb A2) quantification is crucial for diagnosing hemoglobinopathies like beta-thalassemia trait.
- Existing methods, such as starch-block electrophoresis, serve as reference standards but can be labor-intensive.
- Simplified assays are needed for routine clinical laboratory use and population screening.
Purpose of the Study:
- To evaluate a simplified microchromatography assay for Hemoglobin A2 (Hb A2) determination.
- To compare its performance against a reference starch-block electrophoresis method.
- To assess its utility as a routine assay and screening tool for beta-thalassemia trait and iron deficiency anemia.
Main Methods:
- Microchromatography using DEAE-cellulose in Pasteur pipets with a glycine-KCN-NaCl developer.
- Comparison with a standard starch-block electrophoresis method for Hb A2 determination.
- Analysis of day-to-day variation, duplicate determinations, and correlation between methods.
Main Results:
- Microchromatography showed good correlation with starch-block electrophoresis, with no significant difference in mean values across patient groups.
- The microchromatographic method exhibited higher standard deviations and coefficients of variation, indicating increased day-to-day variability.
- Microchromatography tended to overestimate low/normal Hb A2 levels and underestimate high levels; results were more diagnostic when expressed as weight/volume rather than percentage. Commercial kits showed an 18% overestimation.
Conclusions:
- The simplified microchromatography method is a viable option for routine Hb A2 testing and screening, offering a simpler alternative to electrophoresis.
- Careful interpretation is needed due to observed variability and potential biases, particularly when using commercial columns.
- Expressing Hb A2 results in weight/volume enhances diagnostic significance compared to percentages.
