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Alawe,
Although I am not qualified to assess this, I seriously doubt the validity of your doctor's question. I have one brother who is a half-match, and one brother who is no match. I am older than each of them, and as a child I distinctly remember my mother being pregnant with both of them. And she is definitely my biological mother. In fact, just this past week I learned that I've passed a (probably minor) genetic issue from my mother's family down to my son, so she is most definitely my Mom. I'm also confident my brothers and I share the same father.
Having siblings who are half-matches in terms of bone marrow does not indicate that they are only half-siblings.
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Kevin, male age 45; dx SAA 02/2012 - Hgb 5.8, platelets 14, ANC 200, 1% cellularity. Received ATG 03/2012. As of 03/2015, significant improvement - Hgb 15, platelets 158, ANC fluctuates around 1000, Lymphocytes 620. Tapering cyclosporine. BMB 20-30% cellularity.
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