Bone marrow is the tissue that makes blood cells. It is found in the hollow part of most bones. Bone marrow aspiration is the removal of this tissue for examination.

See also:

• Bone marrow biopsy
• Bone marrow culture

The health care provider will take the bone marrow from your pelvic or breast bone. (Occasionally, another bone is selected.) First, the area is cleaned with a germ-killing medicine, then numbing medicine (local anesthesia) is applied.

Next, the health care provider inserts a special needle into the bone. The needle has a tube attached to it, which creates suction. A small sample of bone marrow fluid flows into the tube. The needle is removed.

A laboratory specialist looks at the bone marrow fluid under a microscope.

No special preparation is necessary for this test.

There will be a prick and a slight burning sensation with the local anesthetic. Pressure may be felt as the needle is inserted into the bone. There is a sharp sucking sensation as the marrow is aspirated, which lasts for only a few moments.