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A multi-center ring trial of allergen analysis using fluorescent multiplex array technology.

Authors
King-EM; Filep-S; Smith-B; Platts-Mills-T; Hamilton-RG; Schmechel-D; Sordillo-JE; Milton-D; van Ree-R; Krop-EJM; Heederik-DJJ; Metwali-N; Thorne-PS; Zeldin-DC; Sever-ML; Calatroni-A; Arbes-SJ Jr.; Mitchell-HE; Chapman-MD
Source
J Immunol Methods 2013 Jan; 387(1-2):89-95
NIOSHTIC No.
20042384
Abstract
Background: Consistent performance of allergen assays is essential to ensure reproducibility of exposure assessments for investigations of asthma and occupational allergic disease. This study evaluated intra- and inter-laboratory reproducibility of a fluorescent multiplex array, which simultaneously measures eight indoor allergens in a single reaction well. Methods: A multi-center study was performed in nine laboratories in the US and Europe to determine the inter-laboratory variability of an 8-plex array for dust mite, cat, dog, rat, mouse and cockroach allergens. Aliquots of 151 dust extract samples were sent to participating centers and analyzed by each laboratory on three separate occasions. Agreement within and between laboratories was calculated by the concordance correlation coefficient (CCC). Results Results: Results were obtained for over 32,000 individual allergen measurements. Levels covered a wide range for all allergens from below the lower limit of detection (LLOD = 0.1-9.8 ng/ml) to higher than 6800 ng/ml for all allergens except Mus m 1, which was up to 1700 ng/ml. Results were reproducible within as well as between laboratories. Within laboratories, 94% of CCC were = 0.90, and 80% of intra-laboratory results fell within a 10% coefficient of variance (CV%). Results between laboratories also showed highly significant positive correlations for all allergens (~ 0.95, p < 0.001). Overall means of results were comparable, and inter-laboratory CV% for all allergens except Rat n 1 ranged between 17.6% and 26.6%. Conclusion: The data indicate that performance criteria for fluorescent multiplex array technology are reproducible within and between laboratories. Multiplex technology provides standardized and consistent allergen measurements that will streamline environmental exposure assessments in allergic disease.
Keywords
Allergens; Reproduction; Exposure-assessment; Pulmonary-system; Pulmonary-system-disorders; Diseases; Laboratories; Dusts; Sampling; Analytical-processes; Author Keywords: Allergen measurement; Asthma; Indoor air quality; Immunoassay; Multiplex array; Occupational health
Contact
Eva King, INDOOR Biotechnologies Inc., 1216 Harris Street, Charlottesville, VA 22903
CODEN
JIMMBG
Publication Date
20130101
Document Type
Journal Article
Email Address
eking@inbio.com
Fiscal Year
2013
NTIS Accession No.
NTIS Price
Identifying No.
B20130416
Issue of Publication
1-2
ISSN
0022-1759
NIOSH Division
HELD
Source Name
Journal of Immunological Methods
State
VA; MD; WV; MA; IA; NC
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