Here is a quick data sheet that shares some information. I want to say that some of the research many years ago made a correlation between blast count and neupogen, but may have not been taking into account issues like disease progression appropriately.
http://medsfacts.com/study-NEUPOGEN-...ST%20CELLS.php
The link above does not give a lot of context, but does show that the correlation between neupogen and blasts is nearly non-existent. Given modern drug reporting, if there is even a possibility, it is reported.
Another possible concern of the hematologist is the amount of marrow stress that shows up at any given time. I know that when I took Vidaza, the number of immature blood cells that showed up in my blood increased at times, but with anything MDS, it is hard to see what is the cause and what is the effect, and much of it changes over the course of a cycle of treatment.
I would continue to ask more questions and see if there is a need to supplement with antibiotics, antivirals, and/or antifungals in the presence of a low white blood count as an alternative as needed.