Why do I need a bone marrow test?Your health care provider may order a bone marrow aspiration and a bone marrow biopsy if other blood tests show your levels of red blood cells, white blood cells, or platelets are not normal. Too many or too few of these cells may mean you have a medical disorder, such as cancer that starts in your blood or bone marrow. If you are being treated for another type of cancer, these tests can find out if the cancer has spread to your bone marrow.
