The levels of IgG2b monoclonal antibodies against LD H-C4 in sera of mice bearing hybridoma backpack tumors secreting anti-LDH-C4-IgG2b were detected by quantitative ELISA． The accuracy between batches is 7.04%～l3.30 %, the intra-assay variation is 3.6l%～l0.20%． Standard curveof monoclonal lgG2b was well correlated (r=0.962 884～0.996 795)． The sensitivit y of the assay reach e dup to0.0l?mg/L． The present modified ELISA offers a reproducible, se nsitive, specific method in determination of antigen-specific IgG2b antibody in sera．
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