hematology and oncology
Megaloblastic Macrocytic Anemias
Key Points
Megaloblasts are large nucleated red blood cell precursors with noncondensed chromatin. The most common causes of megaloblastic, macrocytic anemia are deficiency or defective utilization of vitamin B12 or folate. Do complete blood count, red blood cell indices, reticulocyte count, and peripheral smear. Measure vitamin B12 and folate levels and consider methylmalonic acid and homocysteine testing. Treat the cause of B12 or folate deficiency. 