All of the following are features of Monoclonal Gammopathy of Undetermined Significance (MGUS), EXCEPT:
Bone marrow plasma cells are less than 10 % in MGUS. Ref:Harrisons Principles of Internal Medicine, 18th Edition, Page 940
M protein in serum
Bone marrow clonal plasma cells >10%
No evidence of other B cell proliferative disorders
No myeloma-related organ or tissue impairment