NCIt definition : Aplastic anemia that is characterized by bone marrow (BM) cellularity less than 25%
(or less than 50% if BM is comprised of less than 30% hematopoietic cells), and two
or more of the following: absolute neutrophil count of less than 200 per microliter;
platelet count of less than 20,000 per microliter; or an absolute reticulocyte count
of less than 20,000 per microliter.;