Which smear finding is most characteristic of marrow fibrosis on a complete blood count review?

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Multiple Choice

Which smear finding is most characteristic of marrow fibrosis on a complete blood count review?

Marrow fibrosis creates a stiff, crowded marrow environment that distorts developing red cells and pushes immature cells into the circulation. This produces a leukoerythroblastic picture with tear drop (dacrocyte) red cells and often nucleated red blood cells, a hallmark smear finding when marrow is fibrosed. The damaged marrow releases these distorted cells as it tries to cope with fibrotic changes, and the presence of nucleated red cells signals extramedullary hematopoiesis responding to marrow failure. Other smear patterns aren’t as characteristic of marrow fibrosis. Target cells point more to altered hemoglobin or membrane conditions; spherocytes arise in membrane-skeleton defects or autoimmune hemolysis; macrocytes with anisopoikilocytosis occur with megaloblastic processes or alcohol-related/megaloblastic-like states.

Marrow fibrosis creates a stiff, crowded marrow environment that distorts developing red cells and pushes immature cells into the circulation. This produces a leukoerythroblastic picture with tear drop (dacrocyte) red cells and often nucleated red blood cells, a hallmark smear finding when marrow is fibrosed. The damaged marrow releases these distorted cells as it tries to cope with fibrotic changes, and the presence of nucleated red cells signals extramedullary hematopoiesis responding to marrow failure.

Other smear patterns aren’t as characteristic of marrow fibrosis. Target cells point more to altered hemoglobin or membrane conditions; spherocytes arise in membrane-skeleton defects or autoimmune hemolysis; macrocytes with anisopoikilocytosis occur with megaloblastic processes or alcohol-related/megaloblastic-like states.

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