The CD34 is an important type of white blood cell which figures prominently when bone marrow transformations are done. This test is often performed to gauge the level of CD34 in your blood as well as to determine your viability as a bone marrow donor. Usually, this test is one in a set of tests that you will have to undertake, before being able to donate your bone marrow; these tests form a critical part in determining whether your HLA markers are a good match with that of the recipient. If you are looking to donate bone marrow, then you need to consult your physician right away. More importantly, this test is also used to assess the health of your immune system as well. If you do experience the following symptoms, then you need to consult your physician right away Fatigue, Dizziness, Dry mouth, Chills, Cramps and joint pains, If any of these sound similar, then it may be an indication of something more serious; do consult with your physician and get a CD34 panel test done at the earliest.