title: Evaluation of a new Sebia kit for analysis of hemoglobin fractions and variants on the Capillarys system.
abstract: We evaluated the analytical performances of the new Sebia kit for quantification of hemoglobin fractions (HbA, HbF and HbA2) and structural hemoglobin variants on the Capillarys system. This automated capillary zone electrophoresis method uses an alkaline buffer with silica capillaries and spectrophotometric detection. Specimen stability was evaluated during 1 month. The reproducibility of migration and the imprecision of quantification were also investigated. Comparison with the Beckman P/ACE system was performed on 202 samples. A total of 131 subjects without any hematological abnormality were analyzed to establish the HbA2 reference ranges based on our local population. Quantification of the Hb fractions and variants exhibited excellent stability for 4 weeks of storage at 4 degrees C, with CVs < 0.3%. The imprecision of the migration normalized to that of HbA2 for all hemoglobins tested (fractions and variants) was low, with a CV of < 2.5%. At physiological and pathological levels, total imprecision ranged from 1.9% to 4.6% for HbA2, from 0.6% to 9.7% for HbF, and from 0.6% to 1% for HbS. Statistical analysis revealed a small proportional negative bias for HbA2 (-8.6%). Small systematic bias (-0.2%) and proportional bias (-28%) were observed for HbF. No statistically significant difference was found for HbS. The reference range for HbA2 was 2.1-3.2%. The Capillarys system is a fully automated and accurate system that gives high-resolution performance and displays appropriate characteristics for use as a routine method for the diagnosis of thalassemias and hemoglobinopathies.
authors.affiliation: Department of Clinical Chemistry, University Hospital St Luc, Brussels, Belgium.
authors.forename: Amal
authors.initials: A
authors.lastname: Louahabi
authors.forename: Marianne
authors.initials: M
authors.lastname: Philippe
authors.forename: Salah
authors.initials: S
authors.lastname: Lali
authors.forename: Pierre
authors.initials: P
authors.lastname: Wallemacq
authors.forename: Diane
authors.initials: D
authors.lastname: Maisin
mesh_terms: D000328:Adult; D001322:Autoanalysis; D001797:Blood Protein Electrophoresis / Q000379:methods; D002648:Child; D002675:Child, Preschool; D019075:Electrophoresis, Capillary / Q000379:methods*; D005319:Fetal Hemoglobin / Q000032:analysis; D006403:Hematologic Tests; D006441:Hemoglobin A / Q000032:analysis; D006443:Hemoglobin A2 / Q000032:analysis; D006453:Hemoglobinopathies / Q000175:diagnosis*; D006454:Hemoglobins / Q000032:analysis*; D006801:Humans; D011933:Reagent Kits, Diagnostic; D012016:Reference Values; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012822:Silicon Dioxide / Q000737:chemistry; D013053:Spectrophotometry; D013789:Thalassemia / Q000175:diagnosis*
chemical_list: D006454:Hemoglobins; D011933:Reagent Kits, Diagnostic; D012822:Silicon Dioxide; D006441:Hemoglobin A; D006443:Hemoglobin A2; D005319:Fetal Hemoglobin