The Bone Marrow MPO Stain test is basically performed on a sample of bone marrow. The main objective of this test is to measure the level of bone marrow pathology in the sample of bone marrow. The bone marrow sample is collected from the bone of the patient and is then sent to the laboratory for further studies, depending on the reports and results of this test further treatment is done by the doctor. The basic objective of this test is to detect whether Leukaemia is present in the bone marrow sample or not.