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What is a Bone Marrow Test?

From , former About.com Guide

Updated March 07, 2007

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Question: What is a Bone Marrow Test?
Answer:

The bone marrow is a soft pulpy tissue found inside some bones in the body. The bone marrow contains cells that ultimately develop into the different types of blood cells - red cells, white cells and platelets.

Doctors test the bone marrow by removing a small amount of it and seeing it under the microscope. There are two types of bone marrow tests – bone marrow aspiration and bone marrow biopsy. In aspiration, a thin needle is used to simply suck out some cells from the marrow. In a bone marrow biopsy a small tissue piece is removed intact from the marrow using a thicker needle.

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