Cytogenetic abnormalities commonly associated with B-cell non-Hodgkin lymphomas (NHL) are detected by fluorescence in situ hybridization (FISH). Probes for BCL6 (3q27.3), 6q (6q-/-6), MYC (8q24.21), IGH/CCND1 t(11;14), IGH/BCL2 t(14;18) and MALT1 (18q21) are included in the B-NHL FISH Profile.