assay enzyme-linked immunosorbent assay enzyme-linked immunosorbent assay ELISA 1) Detection of IL-2 (analyte) in a cell supernatant (evaluant), using plate bound anti IL-2 antibodies, and a reporter enzyme-linked reporter antibody. 2) Measurement of IgG antibody (analyte) titer in a serum sample (evaluant) using plate bound antigen and a reporter anti-IgG antibody. IEDB IEDB An analyte assay where binding of an enzyme linked antibody to a material entity that is immobilized on solid support is detected utilizing a chemiluminescent reaction. Depending on the setup, the enzyme-linked antibody could be binding directly to the analyte, or it serves as a secondary antibody detecting binding of the primary antibody to the analyte.