The Abbott CELL-DYN 4000 (CD 4000) is a fully automated hematology analyzer that uses 4-angle argon laser light scatter and 2-color fluorescence flow cytometry. The analyzer provides the laboratory with up to 26 blood count parameters, including reticulocytes, immature reticulocyte fraction, nucleated RBCs, blasts, bands, immature granulocytes, and variant lymphocytes; in addition, fluorescence technology also provides a new intrasample quality control feature, the WBC viable fraction
