CD5 and monoclonal gammopathy: Median values (1st–3rd quartile) were 1.47 (1.31–1.73) in mature B lymphocytes, 1.59 (1.40–1.96) in CD5+ B lymphocytes, 1.47 (1.20–1.67) in plasma cells, and 1.53 (1.08–2.45) in CD56+ plasma cells, indicating a balanced light chain production and ruling out monoclonal gammopathy.