What condition is characterized by the presence of Heinz bodies?

What condition is characterized by the presence of Heinz bodies?

• A. Thalassemia
• B. G6PD deficiency
• C. Sickle cell anemia
• D. Iron deficiency anemia

Answer: (B)

Heinz bodies are inclusions of denatured hemoglobin that form inside red blood cells after oxidative damage. They arise when oxidative stress overwhelms the red cell’s defenses, as in G6PD deficiency, where a lack of NADPH reduces the ability to neutralize oxidants and keeps hemoglobin from staying in its functional form. Oxidized hemoglobin precipitates and appears as Heinz bodies, and the spleen may remove them, creating bite cells on smear. This is why G6PD deficiency is the condition associated with Heinz bodies. The other conditions listed—thalassemia, sickle cell disease, and iron deficiency anemia—have characteristic smear features (imbalanced globin synthesis, sickling, or microcytosis with hypochromia, respectively) that do not involve Heinz body formation. Heinz bodies can be visualized with supravital stains such as new methylene blue.

Heinz bodies are inclusions of denatured hemoglobin that form inside red blood cells after oxidative damage. They arise when oxidative stress overwhelms the red cell’s defenses, as in G6PD deficiency, where a lack of NADPH reduces the ability to neutralize oxidants and keeps hemoglobin from staying in its functional form. Oxidized hemoglobin precipitates and appears as Heinz bodies, and the spleen may remove them, creating bite cells on smear.

This is why G6PD deficiency is the condition associated with Heinz bodies. The other conditions listed—thalassemia, sickle cell disease, and iron deficiency anemia—have characteristic smear features (imbalanced globin synthesis, sickling, or microcytosis with hypochromia, respectively) that do not involve Heinz body formation. Heinz bodies can be visualized with supravital stains such as new methylene blue.