A multi-centre evaluation of the intra-assay and inter-assay variation of commercial and in-house anti-cardiolipin antibody assays

Richard Wong, Emmanuel Favaloro, Wendy Pollock, Robert Wilson, Michelle Hendle, Stephen Adelstein, Karl Baumgart, Paul Homes, Stuart Smith, Richard Steele, Allan Sturgess, David Gillis

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41 Citations (Scopus)

Abstract

AIMS: To assess the intra-assay (intra-run) and inter-assay (inter-run) variation of commercial and in-house IgG and IgM anti-cardiolipin antibody (aCL) assays/kits, and to determine an appropriate maximum value for inclusion in consensus guidelines.

METHODS: Frozen aliquots of two patient specimens and one commercial control were sent to nine laboratories for the evaluation of eight commercial kits and one in-house assay. Intra-assay and inter-assay evaluations were performed with all three samples for IgG aCL, and one patient specimen for IgM aCL.

RESULTS: The IgG and IgM aCL values varied considerably between the nine assays/kits. The majority of assays/kits demonstrated less than 20% intra-assay and inter-assay variation, with lower intra-assay and inter-assay variation observed with the commercial control. Single calibrator assays were not consistently associated with higher inter-assay variation than multi-point calibrator assays.

CONCLUSIONS: An inter-assay coefficient of variation of 20% was determined to be an appropriate maximum value for inclusion in the Australasian aCL Working Party consensus guidelines. Improved standardisation between different assay/kits is still required.

Original languageEnglish
Pages (from-to)182-92
Number of pages11
JournalPathology
Volume36
Issue number2
DOIs
Publication statusPublished - Apr 2004

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