What Tests Does a Hematopoietic Stem Cell Donor Need?
Overview: Before donation, potential stem cell donors undergo medical tests to determine whether collection is safe and whether they are suitable for the intended patient. The evaluation generally covers overall health, blood tests, infection screening, organ function and HLA typing.
Why are so many tests needed?
The assessment has three main purposes: to confirm that the donor is medically suitable, to evaluate the safety of stem cell collection, and to determine compatibility between donor and patient. Even someone who feels completely well still needs formal testing because some health issues may not cause obvious symptoms.
What tests are commonly performed?
Doctors first review age, current health, medical and surgical history, medications and relevant family history. Blood tests help assess white cells, red cells and platelets and may identify anemia, infection or blood abnormalities. ABO and Rh blood type may also be checked, although donor and patient do not always need to share the same blood type.
HLA typing is a key part of allogeneic transplantation because it measures immune compatibility. A closer HLA match generally helps reduce immune-related transplant risks. Infection screening and assessment of major organ function are also important for donor and recipient safety.
Is HLA the only important test?
No. A high HLA match does not override a significant health risk in the donor. The transplant team considers HLA compatibility together with donor health, patient status, donor source and overall transplant risk.
What if an abnormal result is found?
An abnormal result does not always mean donation is impossible. The team considers the type and severity of the abnormality and its possible effect on both donor and patient. Minor abnormalities may not prevent donation, while serious risks may make a donor unsuitable.
How long does donor testing take?
Timing varies with the donor source, number of tests, hospital arrangements and the patient's transplant schedule. Unrelated donor searches may take longer because registry searching, preliminary matching and confirmatory testing are required.