assay single-value binding of antibody with reporter to antigen assay An assay that detects the linking of antigens and antibodies via special signaling mechanisms, such as EIA, ELISA, chemiluminescence, etc. that produces one measure (quantitative or qualitative) of the analyte of interest Detection of SARS-CoV-2 IgG antibodies by an immunoassay method, such as enzyme-linked immunosorbent assay. This test is used in conjunction with SARS-CoV-2 IgA and IgM to aid in the diagnosis of COVID-19 and in the identification of individuals infected with SARS-CoV-2. IA LOINC User's Guide, Version 2.68, PUBLISHED JUNE 2020, page 47 LOINC indicates that this class would not include flow cytometry or any technique that can determine the localization of an analyte, such as peroxidase immune staining or indirect immunofluorescence (IFA) Mark Andrew Miller, ORCID:0000-0001-9076-6066 https://github.com/obi-ontology/obi/issues/1203 immunoassay single-value binding of antibody with reporter to antigen assay metadata complete