A common finding in a stained blood smear from an animal with autoimmune hemolytic anemia is:

A common finding in a stained blood smear from an animal with autoimmune hemolytic anemia is:

• A. Lymphocytosis
• B. Basophilic stippling
• C. Spherocytosis
• D. Leukemia

Answer: (C)

Autoimmune hemolytic anemia causes red blood cells to be targeted by antibodies, leading to their destruction. This immune attack often results in loss of red cell membrane as the cells are removed by splenic macrophages. The membrane loss makes the cells become smaller and rounder, losing their central pallor, which is why spherocytes appear on a stained blood smear. Seeing these spherical red cells is the classic smear clue that the anemia is immune-mediated and primarily due to extravascular hemolysis. Other options don’t fit as well because they describe different processes or cell types: lymphocytosis refers to more lymphocytes, not a change in red cell morphology; basophilic stippling shows ribosomal RNA aggregates in red cells typical of lead poisoning or certain anemias, not AIHA; and leukemia is a malignancy of white blood cells, not a smear finding characterized by altered red cells. So the presence of spherocytes best explains the smear finding in autoimmune hemolytic anemia.

Autoimmune hemolytic anemia causes red blood cells to be targeted by antibodies, leading to their destruction. This immune attack often results in loss of red cell membrane as the cells are removed by splenic macrophages. The membrane loss makes the cells become smaller and rounder, losing their central pallor, which is why spherocytes appear on a stained blood smear. Seeing these spherical red cells is the classic smear clue that the anemia is immune-mediated and primarily due to extravascular hemolysis.

Other options don’t fit as well because they describe different processes or cell types: lymphocytosis refers to more lymphocytes, not a change in red cell morphology; basophilic stippling shows ribosomal RNA aggregates in red cells typical of lead poisoning or certain anemias, not AIHA; and leukemia is a malignancy of white blood cells, not a smear finding characterized by altered red cells. So the presence of spherocytes best explains the smear finding in autoimmune hemolytic anemia.