The skin is cleansed, and a local anesthetic is injected to numb the skin. The biopsy needle is then inserted into the bone. The core of the needle will then be removed, and the needle is pressed forward and rotated in both directions. This forces a tiny sample of the bone marrow into the needle. The needle is then removed.
Pressure is applied to the biopsy site to stop bleeding and a bandage is applied.
How to prepare for the test Inform the health care provider if you have allergies to any medications, about which medications you are taking, and if you have bleeding problems. The health care provider should also know if you are pregnant . You must sign a consent form. The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. How the test will feel There will be a sharp stinging from the anesthetic injection.