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The doc states there
ECLIA (electrochemiluminescence
immunoassay) is a type of immunoassay.An
immunoassay is a biochemical test that measures the concentration of a substance, using the reaction of an antibody or antibodies to its antigen.Depending on what is linked to either the antibody or the antigen, there are several types of immunoassay: enzyme immunoassay (EIA), radioimmunoassay (RIA), magnetic labels (MIA), Enzyme-Linked Immunosorbent Assay (ELISA).