Apheresis product total CD34 cell count prediction at peripheral stem cell collection via a formula: A multicenter study.

Introduction: Effective mobilization of Stem Cells(SCs) to peripheral blood (PB) is crucial for obtaining sufficient CD34 cell numbers via apheresis. The ratio of pre-apheresis PB CD34 cells is the best parameter for predicting the product CD34 cell count. However, quantitating CD34 PB cells requires flow cytometry, which usually takes two or more hours to obtain the results.