Test Details: CD38 is a single chain, 45 kDa transmembrane molecule, which has multifunctional activity. It has enzymatic and adhesion molecule functions. CD38 is highly expressed on most multiple myeloma cells. It is used as a marker of activation and present on many hematopoietic cells, especially plasma cells. It is also used clinically as a prognostic marker in CLL chronic lymphocytic leukaemia as evaluated by flow cytometry tests.