MPO is a peroxidase enzyme with roles in innate immunoresponse and various diseases. Cayman's MPO (human) ELISA Kit is a sandwich assay that can be used to measure MPO in plasma and serum without prior sample purification. This assay has been validated using plasma and serum from healthy volunteers and has also been validated in RPMI-1640 with 10% fetal bovine serum. The standard curve spans the range of 0.16-10 ng/ml and has a sensitivity (defined as LLOQ) of 0.2 ng/ml.