serum immunoglobulin measurement Clinical_Measurement.ontology CMO:0001276 JSmith 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 serum, the clear liquid that separates from blood after it has clotted completely, i.e. blood plasma from which fibrinogen has been removed. 2013-01-08T18:17:44Z blood immunoglobulin measurement