Which condition presents with microcytic anemia that does not improve with iron supplementation?

Which condition presents with microcytic anemia that does not improve with iron supplementation?

• A. Aplastic anemia
• B. Iron deficiency anemia
• C. Thalassemia
• D. Vitamin B12 deficiency

Answer: (C)

Focusing on the pattern of microcytic anemia that doesn’t improve with iron points to a cause of abnormal hemoglobin synthesis rather than iron shortage. Thalassemia fits this scenario: mutations reduce production of the alpha or beta globin chains, producing smaller, pale red cells (microcytosis with hypochromia) despite normal or even ample iron stores. Because the problem isn’t iron availability, adding iron doesn’t correct the anemia. In practice, iron studies are often normal or high-normal, and hemoglobin electrophoresis shows abnormal Hb patterns (such as elevated HbA2 in beta-thalassemia trait). The other conditions either present with different cell sizes or do respond to iron: iron deficiency anemia improves with iron therapy and is typically due to actual iron shortage; vitamin B12 deficiency causes macrocytic anemia; aplastic anemia is not characteristically microcytic and involves broader bone marrow failure.

Focusing on the pattern of microcytic anemia that doesn’t improve with iron points to a cause of abnormal hemoglobin synthesis rather than iron shortage. Thalassemia fits this scenario: mutations reduce production of the alpha or beta globin chains, producing smaller, pale red cells (microcytosis with hypochromia) despite normal or even ample iron stores. Because the problem isn’t iron availability, adding iron doesn’t correct the anemia. In practice, iron studies are often normal or high-normal, and hemoglobin electrophoresis shows abnormal Hb patterns (such as elevated HbA2 in beta-thalassemia trait). The other conditions either present with different cell sizes or do respond to iron: iron deficiency anemia improves with iron therapy and is typically due to actual iron shortage; vitamin B12 deficiency causes macrocytic anemia; aplastic anemia is not characteristically microcytic and involves broader bone marrow failure.