In contracst, there are some range of values where the CLIA method give a positive results but not the ELISA. Specifically as follows: For HIV results ≥ 20 (S / CO), HBV results (50 (S / CO), HCV results ≥14 (S / CO), both CLIA and ELISA methods are reactive; conversely, for HIV results from 0, 9 <20 (S / CO), HBV from 0.9 <50 (S / CO), HCV from 0.9 <14 (S / CO), they are negative when performing tests with the ELISA method, the samples continue to test NAT (Nucleotic acid Testing) resulting non-reactive.