Nterassay variability of anti-HLA antibody measurement using luminex single antigen beads (SAB)

Hdl Handle:
http://hdl.handle.net/10147/240272
Title:
Nterassay variability of anti-HLA antibody measurement using luminex single antigen beads (SAB)
Authors:
Caulfield, N; Keegan, D; Harmon, G; Mullany, P; O'Neill, D; Keogan, M
Citation:
Transplant International (2011) 24 SUPPL. 2 (355). : September 2011
Publisher:
Wiley-Blackwell
Journal:
Transplant International
Issue Date:
Sep-2011
URI:
http://hdl.handle.net/10147/240272
Additional Links:
http://onlinelibrary.wiley.com/doi/10.1111/j.1432-2277.2011.01353.x/pdf
Abstract:
Measurement of anti-HLA antibodies using Luminex SAB has been widely adopted, however there is no consensus about cut-off for clinically relevant cut-offs. There is little published data about the performance characteristics of these assays. Objectives: To define the interassay variability of antibody levels in patient serum. Methods: Retrospective review of internal quality control data from SAB assays performed in our laboratory over a one year period. A serum-pool prepared from multiple samples from a single, highly-sensitised patient served as an internal quality control (IQC), and was included in all runs of One Lambda SAB. The Tepnel positive control was similarly evaluated. Levy-Jennings plots were maintained for 3 beads giving high, low and borderline values. 128 runs were analysed for the one lambda SAB, while 23 runs of Tepnel SAB were included. Results: The strongly positive IQC value gave a mean MFI of 19,185 (range 13,587 to 23,023, CV 8.5%). The low-positive bead gave a mean MFI of 1154 (range 714-2090, CV 16.9%). The borderline value gave a mean MFI of 647 (range 401-1235, CV 20%). Levy-Jennings plots showed significantly decreased lab temperature on MFIs for all beads rose significantly when the laboratory temperature dropped. Interassay CV was lower for the Tepnel assay with weak values, but greater with strongly positive values. The strongly positive bead showed a mean adjusted-value 3 of 47 (range 32-113, CV 28.4%). The medium bead showed a mean adjusted-value 3 of 10.9 (range 8.6-14.6, CV 13.1%), while the low IQC showed an adjusted-value 3 of 6.49 (range 5.4 -7.5, CV 9.4%). Conclusion: Luminex SAB assays show significant interassay variability, within a single laboratory. Manufacturers should improve the quality of asays. Despite apparent simplicity, SAB assays should be interpreted by experienced H & I personnel.
Item Type:
Conference Presentation
Language:
en

Full metadata record

DC FieldValue Language
dc.contributor.authorCaulfield, Nen_GB
dc.contributor.authorKeegan, Den_GB
dc.contributor.authorHarmon, Gen_GB
dc.contributor.authorMullany, Pen_GB
dc.contributor.authorO'Neill, Den_GB
dc.contributor.authorKeogan, Men_GB
dc.date.accessioned2012-08-28T15:07:56Z-
dc.date.available2012-08-28T15:07:56Z-
dc.date.issued2011-09-
dc.identifier.citationTransplant International (2011) 24 SUPPL. 2 (355). : September 2011en_GB
dc.identifier.urihttp://hdl.handle.net/10147/240272-
dc.description.abstractMeasurement of anti-HLA antibodies using Luminex SAB has been widely adopted, however there is no consensus about cut-off for clinically relevant cut-offs. There is little published data about the performance characteristics of these assays. Objectives: To define the interassay variability of antibody levels in patient serum. Methods: Retrospective review of internal quality control data from SAB assays performed in our laboratory over a one year period. A serum-pool prepared from multiple samples from a single, highly-sensitised patient served as an internal quality control (IQC), and was included in all runs of One Lambda SAB. The Tepnel positive control was similarly evaluated. Levy-Jennings plots were maintained for 3 beads giving high, low and borderline values. 128 runs were analysed for the one lambda SAB, while 23 runs of Tepnel SAB were included. Results: The strongly positive IQC value gave a mean MFI of 19,185 (range 13,587 to 23,023, CV 8.5%). The low-positive bead gave a mean MFI of 1154 (range 714-2090, CV 16.9%). The borderline value gave a mean MFI of 647 (range 401-1235, CV 20%). Levy-Jennings plots showed significantly decreased lab temperature on MFIs for all beads rose significantly when the laboratory temperature dropped. Interassay CV was lower for the Tepnel assay with weak values, but greater with strongly positive values. The strongly positive bead showed a mean adjusted-value 3 of 47 (range 32-113, CV 28.4%). The medium bead showed a mean adjusted-value 3 of 10.9 (range 8.6-14.6, CV 13.1%), while the low IQC showed an adjusted-value 3 of 6.49 (range 5.4 -7.5, CV 9.4%). Conclusion: Luminex SAB assays show significant interassay variability, within a single laboratory. Manufacturers should improve the quality of asays. Despite apparent simplicity, SAB assays should be interpreted by experienced H & I personnel.en_GB
dc.language.isoenen
dc.publisherWiley-Blackwellen_GB
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1111/j.1432-2277.2011.01353.x/pdfen_GB
dc.titleNterassay variability of anti-HLA antibody measurement using luminex single antigen beads (SAB)en_GB
dc.typeConference Presentationen
dc.identifier.journalTransplant Internationalen_GB
dc.description.provinceLeinsteren
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