An allogeneic transplant is a medical procedure where a patient receives stem cells or bone marrow from a genetically different donor. This type of transplant is often used to treat conditions like leukemia, lymphoma, and other blood disorders. The donor can be a relative or an unrelated person who matches the patient's tissue type. The main goal of an allogeneic transplant is to replace damaged or diseased bone marrow with healthy cells. After the transplant, the new cells can help the patient's body produce healthy blood cells, improving their overall health and immune function.