The subject matter of this invention is a novel method to augment the process of obtaining populations of placental hematopoietic stem and progenitor cells for use in medical practices. A method of augmentation of stem cells collection from placenta is claimed comprising the steps of (a) infusing placental vessels cell preservation compound and a with a composition containing blockers of cell adhesion receptors, (b) incubating said placenta for a sufficient period of time, (c) placing placenta in a containment with sufficient intensity of electromagnetic or ultrasound field for a sufficient period of time; (d) eluting cell suspension from placental vessels, (e) collecting cell suspension and harvesting cells. Invention further claims a method of treatment a disease by means of administering therapeutic composition containing said placental-derived hematopoietic stem cells.