alexa Luminex donor-specific crossmatches.
Nephrology

Nephrology

Journal of Kidney

Author(s): Billen EV, Voorter CE, Christiaans MH, van den BergLoonen EM

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Abstract In Luminex bead-based screening assays, color-coded microspheres coated with human leukocyte antigens (HLA) are used to identify both complement-binding and non-complement-binding HLA class I and II antibodies in recipient sera. Many laboratories rely on their specificity detection and use the information obtained for allocation of donor organs. A donor-specific crossmatch in the Luminex technique (LumXm) is for that reason desirable. A LumXm, in which the actual donor HLA are coated onto specific capture beads, was tested for 88 pre- and posttransplant sera of 18 recipients. The results were compared with previously published flow cytometric crossmatch (FCXm) results for the same donor-recipient combinations. All sera were also examined by Luminex single antigen (SA) tests. Class I LumXm detected 24 of 27 T-cell positive FCXm (89\%) and class II 15 of 22 B-cell positive FCXm (68\%). Sensitivity of LumXm for class I and II was 89\% and 68\% and specificity was 98\% and 97\%, respectively. Discrepant LumXm results were obtained in 13 sera of nine patients (15\%). In general, based on SA testing, FCXm showed false-positive results for class I and LumXm gave false-negative and positive results for class II. The LumXm test was proven not to react with recipient sera containing DQ antibodies only, also DP detection was insufficient. The validity of the LumXm has been shown for class I, but its value for class II is uncertain. HLA-DR is most probably correctly identified, the validity for DQ and DP is doubtful. This article was published in Tissue Antigens and referenced in Journal of Kidney

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