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It is absolutely a logical step in the workup of pancytopenia.
HERE IS A GOOD LINK FOR YOU ON PANCYTOPENIA AND BONE MARROW ASPIRATOIN
The reason is that all the components of blood are made in the bone marrow.
Your friend has low counts of red cells, white cells, and paltelets.
The diagnosis will likely come from the bone marrow aspiration and this will lead to proper therepy.
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