In iron deficiency anemia, which description best fits the red blood cells?

• A. Macrocytic red cells
• B. Microcytic and hypochromic red cells
• C. Normocytic red cells
• D. Hypochromic red cells

Answer: (B)

Iron deficiency anemia reduces hemoglobin synthesis, so the red blood cells become smaller and contain less hemoglobin. That yields microcytosis (small size) and hypochromia (pale color) for the cells, which is the characteristic pattern as iron stores are depleted. While early iron deficiency can show normal size, the classic and most descriptive description as the anemia develops is microcytic and hypochromic red cells.

The other patterns don’t fit as well because macrocytic means large cells (seen with B12 or folate issues), and while hypochromia can occur, saying just hypochromic ignores the reduced size. Normocytic describes normal-sized cells, which is more typical early on or in other anemias, not the defining feature of iron deficiency.