MedlinePlus Medical Encyclopedia: Bone marrow aspiration

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Bone marrow aspiration

Contents of this page:
Illustrations Alternative names Definition How the test is performed How to prepare for the test	How the test will feel Why the test is performed Normal Values What abnormal results mean What the risks are

Illustrations

Bone marrow aspiration

Sternum - view of the outside (anterior)

Alternative names Return to top

Iliac crest tap; Sternal tap

Definition Return to top

The bone marrow is the tissue that manufactures the blood cells and is in the hollow part of most bones. This test is done by suctioning some of the bone marrow for examination.

How the test is performed Return to top

The site of puncture will be cleansed with an antiseptic solution, and you will be given a local anesthetic at the area. The site may be the pelvic bone or the breastbone.

Occasionally, another bone is selected. Then, a thin aspirating needle (a needle with a syringe attached that will create a suction) is inserted, and a small sample of the bone marrow fluid is withdrawn. The fluid is placed on a slide for microscopic examination.

How to prepare for the test Return to top

No special preparation is necessary for this test.

Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experiences, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:

Infant test or procedure preparation (birth to 1 year)
Toddler test or procedure preparation (1 to 3 years)
Preschooler test or procedure preparation (3 to 6 years)
Schoolage test or procedure preparation (6 to 12 years)
Adolescent test or procedure preparation (12 to 18 years)

How the test will feel Return to top

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.

Why the test is performed Return to top

This test is used to diagnose leukemia and other disorders that affect the blood. It may help determine if cancers have metastasized (spread). It is also helpful in diagnosing some types of anemia and infections.

Normal Values Return to top

The marrow should contain hematopoietic cells (blood forming), fat cells, and connective tissues.

What abnormal results mean Return to top

The examination of the bone marrow can help diagnose myelofibrosis, granulomas, lymphoma, cancer, anemias, causes of thrombocytopenia (low platelets), and thrombocytosis (high platelets). In addition to examination of the marrow smear, genetic studies can be performed. Different stains may help in identifying a type of cancer or anemia.

Additional conditions under which the test may be performed:

What the risks are Return to top

There may be some bleeding at the puncture site. More serious risks, such as serious bleeding or infection, are very rare.

Update Date: 5/8/2003

Updated by: Marcia S. Brose, M.D., Ph.D., Division of Hematology/Oncology, Hospital of the University of Pennsylvania, Philadelphia, PA. Review provided by VeriMed Healthcare Network.

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