Test Details: CD23 is a low affinity immunoglobulin E (IgE) receptor. It is found on mature B cells, activated macrophages, eosinophils, follicular dendritic cells (FDCs), platelets and megakaryocytes. It is used to differentiate between small lymphocytic lymphoma (SLL) / chronic lymphocytic leukaemia (CLL) (CD23+) from mantle cell lymphoma or MALT lymphoma (CD23-). Thus it used as a B cell marker, particularly for SLL / CLL, mediastinal large B cell lymphoma, lymphoplasmacytic lymphoma and diffuse follicular lymphoma in flow cytometric analysis.