CD's Microcystin ELISA Kit is a competitive assay that can be used for quantification of microcystin in various natural water samples. The assay has a range of 0.027-8 ng/ml (0.027-8 ppb) with a midpoint of approximately 0.658ng/ml(0.658 ppb)(50%B/B0)and asensitivity(80%B/B0)of approximately 0.196 ng/ml(0.196 ppb). Often environmental reports involving testing of natural sources such as water samples report numbers in part per billion (ppb) as the unit of concentration. In this kit, we report in ng/ml, since 1 ng/ml equals 1 ppb, the units can be used interchangably.