double antibody sandwich assay
Definition: a test for antigen; an application of the ELISA method in which material being tested for antigen is added to wells coated with known antibody; the presence of antigen fixed to the antibody coat can be determined either directly, by adding antibody linked to the enzyme of the indicator system or indirectly, by first adding unlabeled known antibody, the attachment of which to the antigen can be demonstrated by addition of immunoglobulin-specific antibody linked to the enzyme.
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