plasma immunoglobulin measurement 2010-12-30T12:33:33Z Any measurement related to immunoglobulin, any of several classes of proteins produced by plasma cells and lymphocytes which play essential roles in the immune system, for example, attaching to foreign substances in an effort to destroy them, in plasma, the fibrinogen-containing fluid portion of the blood in which the particulate components are suspended. CMO:0000477 clinical_measurement_ontology mshimoyama blood immunoglobulin measurement