Inter and intra laboratory concordance of HLA antibody results obtained by single antigen bead based assay
| Autor: | David F. Lorentzen, Steven R. DeGoey, Manish J. Gandhi, Mark D. Stegall, Sarah M. Jenkins, Deborah K. Falbo, James R. Stubbs, Jar How Lee, Harriet Noreen |
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| Rok vydání: | 2012 |
| Předmět: |
Concordance
Immunology Antibodies symbols.namesake Antibody Specificity HLA Antigens Immunology and Allergy Medicine Humans Avidity Hla antibodies Single antigen bead Protocol (science) business.industry Mean fluorescence intensity Histocompatibility Testing Reproducibility of Results General Medicine Pearson product-moment correlation coefficient Microspheres symbols Immunologic Techniques Nuclear medicine business Laboratories Intra-laboratory |
| Zdroj: | Human immunology. 74(3) |
| ISSN: | 1879-1166 |
| Popis: | Single antigen bead based assays (SAB) to identify antibodies to HLA are marketed as a qualitative test, however often used as a quantitative test as the results provide mean fluorescence intensity (MFI) which is found to correlate with the strength/avidity of the antibody. We studied the between and within laboratory variability in performing the SAB from one manufacturer. Ten samples were tested at four laboratories according to the manufacturer's suggested protocol. Additionally same samples were tested on four consecutive days in one laboratory. All tests were performed using the same lot of beads and secondary antibody. Results were classified as positive at four different MFI cutoffs: 1000, 5000, 8000 and 10,000. MFI values across and within the laboratory were compared in a pair-wise fashion with Pearson's correlations. Overall concordance for Class-I was 97% between laboratories and 98% within laboratory at all cutoffs. Pair-wise Pearson correlation between laboratories was 0.989-0.99, while within laboratory it was 0.998-0.999. For Class-II, overall concordance between and within laboratory was 98%. Pair-wise Pearson correlation between laboratories was 0.991-0.997, while within laboratory it was 0.997-0.999. There is good correlation between laboratories and within laboratory using the same manufacturer, same lot and same protocol while performing SAB. |
| Databáze: | OpenAIRE |
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