Certified Pediatric Hematology Oncology Nurse (CPHON) Practice Exam

Diamond Blackfan Anemia (DBA) is a type of macrocytic anemia that is primarily characterized by a specific deficiency of red blood cell production due to a defect in erythroid progenitor cells. One of the hallmark laboratory findings in DBA is reticulocytopenia, which refers to a low reticulocyte count. This is significant because reticulocytes are immature red blood cells that are typically released by the bone marrow in response to anemia. In DBA, despite the presence of anemia, the reticulocyte count is low because the marrow is unable to adequately produce new erythrocytes due to the underlying hematological defect. The association of reticulocytopenia with Diamond Blackfan Anemia indicates that the body is not responding appropriately to the anemic state by producing more red blood cells. This finding helps in differentiating DBA from other forms of anemia where increased destruction or loss of red blood cells might lead to a compensatory increase in reticulocyte production. In contrast, conditions like polycythemia, hemolytic anemia, and thrombocytosis are associated with different mechanisms and findings that do not characterize DBA. Polycythemia involves an increase in red blood cell mass, hemolytic anemia often presents with elevated ret