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A bone marrow biopsy is used to study an actual piece of spongy bone marrow. It may be completed at the same time as a bone marrow aspirate. For this test, a needle is placed in a bone (usually the hipbone); a small piece of spongy bone marrow is removed and sent to the laboratory to be tested.
Your child may feel some pain when the needle is placed in the bone and may feel pressure or "tugging" when the needle removes a small piece of spongy bone marrow.