blood immunoglobulin amount blood immunoglobulin M amount 2012-11-28T03:27:18Z EFO:0004993 EFO:0020466 MP:0002494 The proportion, quantity, or volume in whole blood, serum, or plasma of this immunoglobulin formed during the early part of the immune response that is the most efficient antibody in stimulating complement activity. Trait.ontology VT:0010481 caripark immunoglobulin M measurement