Original scientific paper

https://doi.org/10.11613/BM.2013.011

The importance of having a flexible scope ISO 15189 accreditation and quality specifications based on biological variation – the case of validation of the biochemistry analyzer Dimension Vista

Pilar Fernandez-Calle ; Emergency Laboratory, Department of Laboratory Medicine, Hospital Universitario La Paz, Madrid, Spain
Sandra Pelaz ; Emergency Laboratory, Department of Laboratory Medicine, Hospital Universitario La Paz, Madrid, Spain
Paloma Oliver ; Emergency Laboratory, Department of Laboratory Medicine, Hospital Universitario La Paz, Madrid, Spain
Maria Jose Alcaide ; Emergency Laboratory, Department of Laboratory Medicine, Hospital Universitario La Paz, Madrid, Spain
Ruben Gomez-Rioja ; Emergency Laboratory, Department of Laboratory Medicine, Hospital Universitario La Paz, Madrid, Spain
Antonio Buno ; Emergency Laboratory, Department of Laboratory Medicine, Hospital Universitario La Paz, Madrid, Spain
Jose Manuel Iturzaeta ; Emergency Laboratory, Department of Laboratory Medicine, Hospital Universitario La Paz, Madrid, Spain

Abstract

Introduction: Technological innovation requires the laboratories to ensure that modifications or incorporations of new techniques do not alter the quality of their results. In an ISO 15189 accredited laboratory, flexible scope accreditation facilitates the inclusion of these changes prior to accreditation body evaluation. A strategy to perform the validation of a biochemistry analyzer in an accredited laboratory having a flexible scope is shown.
Materials and methods: A validation procedure including the evaluation of imprecision and bias of two Dimension Vista analysers 1500 was conducted. Comparability of patient results between one of them and the lately replaced Dimension RxL Max was evaluated. All studies followed the respective Clinical and Laboratory Standards Institute (CLSI) protocols. 30 chemistry assays were studied. Coefficients of variation, percent bias and total error were calculated for all tests and biological variation was considered as acceptance criteria. Quality control material and patient samples were used as test materials. Interchangeability of the results was established by processing forty patients’ samples in both devices.
Results: 27 of the 30 studied parameters met allowable performance criteria. Sodium, chloride and magnesium did not fulfil acceptance criteria. Evidence of interchangeability of patient results was obtained for all parameters except magnesium, NT-proBNP, cTroponin I and C-reactive protein.
Conclusions: A laboratory having a well structured and documented validation procedure can opt to get a flexible scope of accreditation. In addition, performing these activities prior to use on patient samples may evidence technical issues which must be corrected to minimize their impact on patient results.

Keywords

biological variation; ISO 15189; interchangeability of results; Dimension Vista

Hrčak ID:

97249

URI

https://hrcak.srce.hr/97249

Publication date:

15.2.2013.

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