Bite cells are commonly associated with which deficiency?

Bite cells are commonly associated with which deficiency?

• A. Iron deficiency anemia
• B. Aplastic anemia
• C. G6PD deficiency
• D. Pernicious anemia

Answer: (C)

Bite cells on a peripheral smear arise when the spleen removes Heinz bodies from red blood cells that have been damaged by oxidative stress. In G6PD deficiency, the red cells can’t generate enough NADPH to keep glutathione in the reduced form, leaving hemoglobin vulnerable to oxidation. Oxidative damage causes hemoglobin to denature and form Heinz bodies; splenic macrophages strip these Heinz bodies away, creating the characteristic bite-like indentations. This makes G6PD deficiency the best match, especially after oxidative triggers such as certain drugs (eg, sulfonamides, antimalarials), fava beans, or infections. The other conditions listed—iron deficiency anemia, aplastic anemia, and pernicious anemia—don’t typically produce bite cells because they involve different pathways of red cell pathology (production problems, macrocytosis from B12 deficiency, or non-hemolytic processes) rather than oxidative damage with Heinz body formation.

Bite cells on a peripheral smear arise when the spleen removes Heinz bodies from red blood cells that have been damaged by oxidative stress. In G6PD deficiency, the red cells can’t generate enough NADPH to keep glutathione in the reduced form, leaving hemoglobin vulnerable to oxidation. Oxidative damage causes hemoglobin to denature and form Heinz bodies; splenic macrophages strip these Heinz bodies away, creating the characteristic bite-like indentations.

This makes G6PD deficiency the best match, especially after oxidative triggers such as certain drugs (eg, sulfonamides, antimalarials), fava beans, or infections. The other conditions listed—iron deficiency anemia, aplastic anemia, and pernicious anemia—don’t typically produce bite cells because they involve different pathways of red cell pathology (production problems, macrocytosis from B12 deficiency, or non-hemolytic processes) rather than oxidative damage with Heinz body formation.