Hb Murcia (β118(G19)His&gt;Gln): A New Hemoglobin Variant Found in a Spanish Woman

Fernández, Beatriz; Campuzano, José Bartolomé Nieto; Rocamora, Dolores García; Nieto, Jorge M.; Fernández, Fernando Ataúlfo González; Villegas, Ana; Cuesta, Celina Benavente; Ropero, Paloma

doi:10.3343/alm.2021.41.5.514

Cited by 1 publication

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“…The comparison also included samples with variant Hb to determine how different variant types affect the performance of different HbA1c measurement methods. For example, a newly discovered Hb variant, Hb Murica, was found to affect different HbA1c methods differently [ 7 ]. The variant type was genetically determined using direct sequencing and multiplex ligation-dependent probe amplification (MLPA).…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of the DxC 700 AU Chemistry Analyzer in Hemoglobin A1c Measurement

et al. 2022

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Background: Accurate measurement of glycated hemoglobin (HbA1c) is crucial for a diabetes diagnosis and subsequent patient management. The detection method and presence of variant Hb can interfere with HbA1c measurements. We evaluated the HbA1c-measuring performance of the DxC 700 AU (Beckman Coulter, Brea, CA, USA) immunoassaybased device in comparison with another immunoassay device and the reference method.Methods: A total of 120 normal and 14 variant Hb samples were analyzed using the Cobas c 513 (Roche Diagnostics, Mannheim, Germany) and DxC 700 AU analyzers. Variant Hb samples were also analyzed using the reference method, along with 20 normal samples. The accuracy, precision, linearity, and carryover were determined.Results: DxC 700 AU results strongly correlated with those of Cobas c 513 and exhibited accuracy in comparison with the reference method. The within-run, between-run, betweenday, and total imprecision (%CV) values for the low-and high-concentration control materials were below 2%. The results of DxC 700 AU were linear over a wide HbA1c range (3.39%-18.30%). Although DxC 700 AU performed well in the presence of variant Hb, the HbA1c concentration was underestimated in the presence of fetal Hb. The possibility of interference from a high HbH proportion could not be ruled out. Conclusions:The overall analytical performance of DxC 700 AU was acceptable. The device is accurate, precise, and linear over a wide HbA1c concentration range. Although DxC 700 AU results highly correlated with those of Cobas c 513, caution should be exercised in cases of high HbF and HbH concentrations.

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Section: Introductionmentioning

confidence: 99%