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ELISAs are one of the most sensitive immunoassays available. The typical detection range for an ELISA is 0.1 to 1 fmole or 0.01 ng to 0.1 ng, with sensitivity dependent upon the particular characteristics of the antibody –antigen interaction. In addition, some substrates such as those yielding enhanced chemiluminescent or fluorescent signal, can be used to improve results.
As mentioned earlier, indirect detection will produce higher levels of signal and should therefore be more sensitive. However, it can also cause higher background signal thus reducing net specific signal levels.
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