Is increase in plasma cell 15 percent only related to multiple myloma of other malignancies or infection also?

Myeloma or infection: Multiple myeloma is based on all three of the following for diagnosis: 1) 10% or more monoclonal plasma cells; 2) serum or urine monoclonal protein; 3) organ dysfunction (high serum calcium, high serum creatinine, low hemoglobin, or lytic bone lesions/osteoporosis). If 2) is not present, then bone marrow needs 30% plasma cells. Plasma cells can occur with infections. See a doctor for further help