blood glutathione peroxidase activity level serum glutathione peroxidase activity level 2014-06-05T12:49:15Z CMO:0002442 JSmith The amount of ezymatic activity of glutathione peroxidase in a specified sample of serum, the clear liquid that separates from blood after it has clotted completely, i.e. blood plasma from which fibrinogen has been removed. Glutathione peroxidase (GPx) is an enzyme that catalyzes the reaction of two glutathiones with H2O2, forming glutathione disulfide and two water molecules, and is a crucial enzyme in hydrogen peroxide detoxification. VT:0010630 clinical_measurement_ontology serum GPx activity level serum GSH-Px activity level