Tuesday, October 26, 2010

What is the percentage of bone marrow that is collected during a bone marrow biopsy?

What is the percentage of bone marrow that is collected from the pelvic bone region during a bone marrow biopsy?What is the percentage of bone marrow that is collected during a bone marrow biopsy?
It is about the same amount that is collected.
A bone marrow biopsy may be done in a health care provider's office or in a hospital. Informed consent for the procedure is typically required. The patient is asked to lie on his or her abdomen (prone position) or on his/her side (decubitus position). The skin is cleansed, and a local anesthetic such as lidocaine is injected to numb the area. Patients may also be pretreated with analgesics and/or anti-anxiety medications, although this is not a routine practice.
Typically, the aspirate is performed first. An aspirate needle is inserted through the skin until it abuts the bone. Then, with a twisting motion, the needle is advanced through the bony cortex (the hard outer layer of the bone) and into the marrow cavity. Once the needle is in the marrow cavity, a syringe is attached and used to aspirate ("suck out") liquid bone marrow.
Subsequently, the biopsy is performed if indicated. A different, larger trephine needle is inserted and anchored in the bony cortex. The needle is then advanced with a twisting motion and rotated to obtain a solid piece of bone marrow. This piece is then removed along with the needle. The entire procedure, once preparation is complete, typically takes 5-10 minutes.
Bottom line, they don't need a lot.

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