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Lateral flow immunoassay (LFIA) —an immunochemical method of the assay, based on the principle of the thin-layer chromatography and including the reaction between an antigen and a corresponding antibody in biomaterials (urine, whole blood, blood serum or plasma, saliva, feces, etc.).

Method to detect antigens and antibodies, based on determining the antigen-antibody complex by administering the enzymatic marker reaction into one of the components with its further detection with the help of the corresponding ALLOCHROMOUS substrate.