Clinical Chemistry
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Clinical Chemistry 35: 573-576, 1989;
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Clinical Chemistry, Vol 35, 573-576, Copyright © 1989 by American Association for Clinical Chemistry

Immunoradiometric assay of carcinoembryonic antigen with use of avidin- biotin labeling

J Peters, H Schmidt-Gayk, B Peters, FP Armbruster, A Quentmeier and D Mathias
Clinical Chemistry Laboratory, University of Heidelberg, F.R.G.

In evaluating an enzyme-linked immunoassay of carcinoembryonic antigen (CEA) we found that the IgG fraction of polyclonal anti-CEA antibodies (DAKO) bound very well to the walls of polypropylene test tubes. We therefore developed an immunoradiometric CEA assay based on this binding of polyclonal anti-CEA antibody. We biotinylated a commercially available monoclonal antibody (Hybritech) and bound this to the CEA- anti-CEA bound to the tube wall. For detection we used 125I-labeled streptavidin. In comparison with several immunoassays for CEA this system offered several advantages such as greater linearity of the standard curve (from 0 to 74 micrograms/L), a steeper dose-response curve, and smaller coefficients of variation in the clinically useful range. This assay system may be used for other large molecules, so that only one tracer, the 125I-labeled streptavidin, has to be labeled; thus the technique seems suited for several different assays.




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Copyright © 1989 by the American Association for Clinical Chemistry.