骨髄が抽出しにくい場合はどうすればよいですか？

This is because you suspect that you have a disease in your blood system and want to do a bone marrow biopsy for a clear diagnosis. I don't think this is because the bone is too hard to be drawn. The strength of the bone piercing needle in the hospital is so strong, it is probably a problem of the doctor's level. I suggest you try a better hospital. If you don't want to change, you can only do a blood white blood cell classification plus white blood cell count plus platelet count, which can be roughly screened, of course, the results of bone puncture are not as accurate. Above, hope it can help you

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