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Molecular allergy diagnostics using multiplex assays: methodological and practical considerations for use in research and clinical routine: Part 21 of the Series Molecular Allergology.
The availability of single allergens and their use in microarray technology enables the simultaneous determination of specific IgE (sIgE) to a multitude of different allergens (> 100) in a multiplex procedure requiring only minute amounts of serum. This allows extensive individual sensitization profiles to be determined from a single analysis. Combined with a patient's medical history, these profiles simplify identification of cross-reactivity; permit a more accurate estimation of the risk of severe reactions; and enable the indication for specific immunotherapy to be more precisely established, particularly in cases of polysensitization. Strictly speaking, a multiplex assay is not a single test, but instead more than 100 simultaneous tests. This places considerable demands on the production, quality assurance, and interpretation of data. The following chapter describes the multiplex test systems currently available and discusses their characteristics. Performance data are presented and the sIgE values obtained from multiplex and singleplex assays are compared. Finally, the advantages and limitations of molecular allergy diagnostics using multiplex assays in clinical routine are discussed, and innovative possibilities for clinical research are described. The multiplex diagnostic tests available for clinical routine have now become well established. The interpretation of test results is demanding, particularly since all individual results need to be checked for their plausibility and clinical relevance on the basis of previous history (patient history, clinical symptoms, challenge test results). There is still room for improvement in certain areas, for example with respect to the overall test sensitivity of the method, as well as the availability and quality of particular allergens. The current test systems are just the beginning of a continuous development that will influence and most likely change clinical allergology in the coming years.
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