plasma antibody level blood autoantibody level plasma autoantibody level 2014-01-27T12:48:43Z CMO:0002108 JSmith Measurement of the amount of one or more autoantibodies in a specified sample of plasma. An antibody is an immunoglobulin molecule possessing a specific amino acid sequence that binds to a specific antigen, a substance introduced into an organism which initiates an immune response including the production of the very antibodies which bind to it in an effort to destroy it. An autoantibody is an antibody that attacks the cells, tissues, native proteins, or other endogenous molecules of the organism in which it was formed. clinical_measurement_ontology plasma anti-self antibody level