Definition of M protein
M protein: An antibody or part of an antibody found in unusually large amounts in the blood or urine of patients with multiple myeloma, a form of cancer that arises in plasma cells (white blood cells that produce antibodies).
Last Editorial Review: 4/27/2011 5:27:15 PM
Back to MedTerms online medical dictionary A-Z List
Need help identifying pills and medications?
Get the latest health and medical information delivered direct to your inbox FREE!