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.
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.
Authors: Sujatha Ramachandran; Mitra Singhal; Katherine G McKenzie; Jennifer L Osborn; Amit Arjyal; Sabina Dongol; Stephen G Baker; Buddha Basnyat; Jeremy Farrar; Christiane Dolecek; Gonzalo J Domingo; Paul Yager; Barry Lutz Journal: Diagnostics (Basel) Date: 2013-04-02
Authors: Kimberley W J van der Sloot; Michiel D Voskuil; Tjasso Blokzijl; Annemieke Dinkla; Lars Ravesloot; Marijn C Visschedijk; Hendrik M van Dullemen; Eleonora A M Festen; Behrooz Z Alizadeh; Coretta van Leer-Buter; Rinse K Weersma; Harry van Goor; Ad P Koets; Gerard Dijkstra Journal: J Crohns Colitis Date: 2021-08-02 Impact factor: 9.071