What distinguishes PRCAs such as Diamond-Blackfan syndrome from aplastic anemia?
a. Peripheral red blood count
b. Number of erythroid stem cells in the bone marrow
c. Normal cellularity of myeloid cells
d. Red cell indices
ANS: C
Diamond-Blackfan anemia is characterized by an isolated PRCA and normal cellularity of myeloid cells. Red cell indices are not useful.
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