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MEDICINAL PRODUCTS FOR RADIO-IMMUNOLOGICAL ANALYSIS (R-SETS) are used in the hypersensitive method for measuring the smallest concentrations of substances in the biologically active fluids.

Radio-immunological analysis is invitro diagnostics method based on the competitive reaction between labeled and unlabeled substances (labeled and unlabeled antigens) for bond with the specific perceptive system.

In general, isotope of iodine-125 characterized by high specific radioactivity and short half-life - 60 days - is used for antibodies and antigens labeling.