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 success of an allogeneic transplant depends on various factors, including the compatibility between the donor and recipient. After the transplant, patients may need to take medications to prevent their immune system from rejecting the new cells. This process helps restore healthy blood cell production in the patient's body.