CD34+ cell quantification in peripheral blood is useful to determinate the best moment to begin apheresis while, when applied in leukapheresis products and umbilical cord blood it is important to establish the total number of CD34+ in stem cell transplantation. We aimed at comparing three different methodologies of CD34+ cell quantification. Three different blood products were analyzed: a) peripheral blood samples from 32 patients collected using EDTA, mobilized without previous chemotherapy and with G-CSF 50 mcg/Kg/total. b) 31 leukapheresis samples obtained using a CS 3000 (Baxter) cell separator. c) 20 cord blood samples collected using umbilical venipuncture. All samples were maintained at room temperature and analyzed until 24h after collection by three different methods: double platform protocols ISHAGE, a Mulhouse modified (for analysis of a higher number of events) applied in a Epics XL flow cytometer (Coulter) and a single platform for a fixed volume cytometer IMAGN 2000 (Biometric Imaging) according to manufacturer instructions. Monoclonal antibodies used were: CD 45-FITC, CD 34-PE and IgG1-PE isotype control (Immunotech, Marseille, FR). Statistical analysis was made using ANOVA and T Student test. Results showed no statistical differences (p< 0.05) among the three methods used to quantify CD34+ cells from any sample source.
Flow cytometry; volume fixed cytometry; CD34+ quantification; double platform; single platform
