monoclonal gammopathy

noun

Medical Definition of monoclonal gammopathy 

: any of various disorders marked by proliferation of a single clone of antibody-producing lymphoid cells resulting in an abnormal increase of a monoclonal antibody in the blood serum and urine and that include both benign or asymptomatic conditions and neoplastic conditions (as multiple myeloma and Waldenström's macroglobulinemia)

called also plasma cell dyscrasia

— see m protein sense 2

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