Agreement of seven 25-hydroxy vitamin D3 immunoassays and three high performance liquid chromatography methods with liquid chromatography tandem mass spectrometry.
Clin Chem Lab Med
; 52(4): 511-20, 2014 Apr.
Article
em En
| MEDLINE
| ID: mdl-24152903
ABSTRACT
BACKGROUND:
Several recent studies have shown some discrepancies between 25-hydroxyvitamin D [25(OH)D] assay methods, despite some improvement in the past few years. The accuracy of 25(OH)D assay methods is still a real challenge for clinical laboratories. The aim of this study was to assess the agreement between a large panel of routine assays and a two-dimensional liquid chromatography/tandem mass spectrometry (2D LC-MS/MS) method, selected as the reference method.METHODS:
Forty-nine human plasma samples with only endogenous 25(OH)D3 were analyzed with 11 different methods, especially with three LC-UV methods that differed in the extraction step. Seven routine immunoassays were also tested two manual (RIA and EIA from IDS) and five fully-automated methods. The results of the 25(OH)D3 assays were compared with those of the 2D LC-MS/MS method using weighted Deming regression analysis, Bland-Altman plots and concordance correlation coefficient (CCC). The ability of these methods to properly classify patients was evaluated by sorting results depending on vitamin D status.RESULTS:
The CCC was >0.90 for the three LC-UV methods and for most of the automated IA, meaning substantial agreement with 2D LC-MS/MS results. The ability to properly classify patients according to their vitamin D status was overall satisfactory for most of the methods tested (concordance >90%).CONCLUSIONS:
The immunoassays available on Liaison, Isys, Architect and Elecsys, together with our in-house LC-UV method preceded by an SLE step met the minimum requirements for the assessment of vitamin D status in clinical laboratories.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Vitamina D
/
Imunoensaio
/
Espectrometria de Massas em Tandem
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article