Cytogenetic abnormalities commonly associated with high-grade B-cell non-Hodgkin lymphomas (NHL) are detected by fluorescence in situ hybridization (FISH). Probes for BCL6 (3q27.3), IRF4-DUSP22 (6p25.3), MYC (8q24.21), IGH/BCL2 t(14;18)) are included in the B-NHL High-Grade FISH Profile (Enriched). B-cells are enriched from patient’s specimen using immunomagnetic enrichment technology with CD19/CD20 antibodies.