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Abstract
Previously reported immunochemical assays of beta 2-microglobulin (beta 2m) have usually been based on polyclonal antisera. We have developed a "sandwich"-type time-resolved immunofluorometric assay (TR-IFMA) for beta 2m in serum, based on two monoclonal antibodies against human beta 2m. Microtiter wells are coated with the capture antibody, and the tracer antibody is labeled with a europium chelate. In a simple and fast assay procedure, prediluted serum samples are incubated with the tracer for 1 h in the microtiter wells, after which the wells are washed and the fluorescence of Eu is measured. The mean analytical recovery was 101.8% and results by TR-IFMA showed a good linear correlation with those by an established radioimmunoassay. The analytical range of TR-IFMA is large and well suited for clinical purposes.
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