Or the stem cells can come from another person. In a child, the decision whether to use cells from the bone marrow or the blood depends on the size of the child. A stem cell transplant can use stem cells that come from your own blood or bone marrow. In adults, most autologous transplants use stem cells from blood. This way of collecting stem cells is called apheresis. The machine then returns the remaining blood through a needle in your arm or through a central vascular access device. During an autologous stem cell transplant, blood stem cells are harvested from the blood through a leukapheresis. Your blood is removed from a vein and passed through a machine that separates the stem cells. What is an autologous stem cell transplant. G-CSF is a protein that is produced naturally in the body. The growth factor G-CSF may be used to stimulate the growth of new stem cells so they spill over into the blood. With PBSCT, the stem cells are taken from your blood.
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