Culture and Sensitivity Anaerobic test is performed on a sample of bone marrow to measure the extent of Culture of the infective organism within the bone marrow. It is performed to verify Bone Marrow Infection and additionally throughout the treatment and when the treatment of Bone Marrow Infection is over. Your doctor uses a bone marrow test to look at the fluid and tissue in your marrow. Tests help verify whether or not cancer or another disease has effects on blood cells or marrow, as well as the extent of the disease. Some changes to blood cells are often detected in marrow samples before they'll be seen in blood samples. It is also called C/S Anaerobic Bone Marrow.