What tests show leukemia?

CBCj, flow cytometry: Leukemia is suspected when abnormal cells our found in the blood, or when blood counts are very low. The first test is the CBC (complete blood count). If abnormal cells are in the blood, they can be identified by flow cytometry, which analyzes compounds on the surface of blood cells. The definitive test otherwise is a bone marrow aspirate and biopsy, usually taken from the pelvic bone.