A Bone Marrow Registry is a database that helps match patients in need of a bone marrow transplant with potential donors. This registry includes information about individuals who have volunteered to donate their bone marrow, which is crucial for treating diseases like leukemia and lymphoma. When a patient requires a transplant, doctors search the registry to find a compatible donor. The compatibility is determined by matching specific genetic markers. If a match is found, the donor can provide bone marrow, which can help restore the patient’s health and improve their chances of recovery.