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Clinical Chemistry 32: 1873-1878, 1986;
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Clinical Chemistry, Vol 32, 1873-1878, Copyright © 1986 by American Association for Clinical Chemistry

Two-monoclonal-antibody sandwich-type assay for thyrotropin, with use of an avidin-biotin separation technique

WD Odell, J Griffin and R Zahradnik

We have developed a sensitive, specific, noncompetitive, sandwich-type radioimmunoassay for human thyrotropin (hTSH), which can be performed in 30 min. The assay involves two monoclonal antibodies, selected for high affinity and specificity and also for reaction against antigenic sites on hTSH that are distal from each other. One of these antibodies is labeled with 125I; the other is conjugated covalently to biotin. Polystyrene beads were also conjugated covalently to biotin. After conjugation, the beads were incubated with avidin. These beads represent a rapid, simple method for separating hTSH-bound antibody from free antibody. The biotin-antibody-hTSH-125I-labeled antibody complexes bind to the beads and hTSH concentration is directly related to counts per minute. This assay can detect hTSH at a concentration of 0.06 milli-unit/L in serum.


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Copyright © 1986 by the American Association for Clinical Chemistry.