Bone marrow aspiration is a process where the sample of the soft tissues of the bones is examined. The human body has a spongy tissue inside the bones known as bone marrow. It is the bone marrow that produces white blood cells, red blood cells platelets inside the larger bones. The procedure of bone marrow aspirate takes merely 10 minutes. However, it is preparation and post-procedure that takes time. The procedure can be conducted at a hospital or a clinic. A haematologist or an oncologist conducts the test. Doctors order for the testing when preliminary blood tests show low levels of white blood cells or red blood cells or platelets.