Bone marrow is the spongy tissue present inside bones. Examination of the components of the marrow shows whether your bone marrow is healthy & making normal amounts of blood cells. Your doctor may order a bone marrow examination to diagnose a disease affecting the bone marrow or blood cells; determine stage or disease progression; determine whether iron levels are normal; investigate a long term fever of unknown cause. It helps to detect causes of anemia, tumors, metabolic disorders, parasites & infections. In addition, this panel also includes more detailed biopsy studies which increases the sensitivity of the test.