Well if you have had a bone marrow biopsy done then i would tend to agree with your hematologist. If there was a significant issue with this low WBC count then the bone marrow biopsy would have shown some finding. Secondly if a bone amrrow biopsy was done then a peripheral film was done along with it, even if you dont know about it. But even if it wasnt done a bone marrow is more sensitive.
There are causes for a consistently low WBC count including various syndromes and autoimmune conditions. But the fact is you have not developed any symptoms because of teh low WBC count or any other symptoms which would have caused you to fit into one of these numerous syndromes. For example if you had wiskott aldrich syndrome you would also have immune responses like rashes and bloody diarrhea frequently along with the low WBC count. One thing that you could have is cyclic neutropenia which is a condition in which the WBC count drops every 21 days and alternates begtween monocytes and neutrophils.
Also if by AA you mean to say that you are african american, then YES i would agree with your doctor as upto 35-50% of people belonging to this group can have BENIGN ETHNIC NEUTROPENIA. As the name indicates it is a benign condition an does not cause you to develop any problems in the long run. This is a very common thing and should cause NO issues.
The simple thing is that if this low count was due to a serious underlying pathology then it would have presented itself by now with additional symptoms or caused worsening of your general health (which i assume you havent).
Do you have any more questions?
Please leave a POSITIVE rating by clicking on the stars above, until you do i am not compensated for my time. You can continue to ask follow-up questions even after the POSITIVE rating. You can also ask questions from me directly by going on the link below,