blood immunoglobulin amount immunoglobulin level CMO:0001278 The proportion, quantity, or volume in whole blood, serum, or plasma of members of a diverse group of plasma proteins, made up of polypeptide chains, that function as a primary mechanism for protection against disease. serum level of immunoglobulin EFO:0004556 blood Ig amount EFO:0802622 CMO:0002031 VT:0002460 Trait.ontology blood antibody amount EFO:0010127 blood globulin amount