If an unrelated donor's marrow is used, the procedure is referred to as an allogeneic transplant.
Identical twins can use each other's marrow in a syngeneic transplant.
If you receive an allogeneic or syngeneic transplant, your marrow would not to be collected. All of the pictures on this tour refer to an autologous transplant. Doctors collect the marrow from a bone in your back, called the posterior illiac crest. Patients are given general anesthesia during the operation which usually takes an hour.