Bone marrow transplantation is a procedure in which blood-producing stem cells are implanted in the body to replace damaged or diseased bone marrow. In cases where the bone marrow is not functioning or cannot produce enough healthy blood cells, a bone marrow transplant is necessary. There are two types of bone marrow transplants: autologous and allogeneic. Transplants that use cells from the patient's own body are called autologous transplants, while transplants from a donor are referred to as allogeneic transplants. In this article, we have compiled how both types of transplants are performed for you.