Signal to noise ratio over extended dynamic range of Mouse FGF-21 CatchPoint SimpleStep ELISA kit (ab229382) vs. Mouse FGF-21 SimpleStep ELISA kit (ab212160). In this example, the signal to noise ratio is used for normalization. The dotted lines mark the dynamic range recommended for the colorimetric ELISA kit (ab212160). The fluorescent ELISA kit (ab229382) shows better linearity over the extended dynamic range and increased signal to noise ratio.