It’s ultimately up to a patient’s doctor to decide whether they need stem cells collected from the bloodstream or from the bone marrow based on what’s best for the patient. That’s why you need to understand and be willing to donate via both methods.
If you came up as a match and didn’t want to go ahead, it could have serious consequences if the patient has already started their preparation treatment for a transplant. That’s why we ask you to be fully committed when you sign up.