New technologies in molecular allergodiagnostics

The article presents the characteristics of the ALEX2 (MacroArrayDX, Wien, Austria). It is designed for simultaneous detection of IgE total and specific IgE-aB to 120 extracts and 180 molecules by solid-phase enzyme immunoassay. Extracts and allergen molecules combined with nano-particles are sorbed on a solid-phase substrate, forming a macroscopic multiplex matrix - the immune allergy chip. The Institute of Clinical and Laboratory Standards (CLSI) conducted research on the verification and validation of the ALEX2 in relation to the ImmunoCAP macroarray test system (ThermoFisher Scientific, Uppsala, Sweden), which is often used in allergodiagnostics. The results obtained on the two test systems were comparable. One of the most important features of the ALEX2 test system is that unique allergen molecules and allergenic extracts are included in its composition, and a method has been found to inhibit cross-reactive hydrocarbon determinants (CCDs), which cause frequent non-specific binding of IgE-aT. The use of this test system makes it possible to carry out component allergy diagnostics with the determine of the dominant sensitizing factor in cases of mono- and polyvalent sensitization. The test results affect the determination of indications and the effectiveness of ASIT, allow assessing the risk of anaphylaxis and predicting further treatment tactics for the patient.