Inclusions within RBCs composed of oxidized, denatured hemoglobin that precipitates under oxidative stress are called what?

Inclusions within RBCs composed of oxidized, denatured hemoglobin that precipitates under oxidative stress are called what?

• A. Heinz bodies
• B. Howell-Jolly bodies
• C. Basophilic stippling
• D. Pappenheimer bodies

Answer: (A)

Oxidative stress damages hemoglobin, causing it to denature and precipitate inside red blood cells as small inclusions attached to the inner membrane. These inclusions are Heinz bodies. They form when oxidants convert hemoglobin to a denatured form that aggregates, a situation seen in conditions like G6PD deficiency or after exposure to oxidant drugs. On supravital stains, Heinz bodies appear as round precipitates within the cell. The spleen normally removes these inclusions, which can lead to bite cells when macrophages partially remove them. Other RBC inclusions have different causes and appearances: Howell-Jolly bodies are DNA remnants from splenic dysfunction; basophilic stippling reflects RNA granules seen in lead poisoning and some anemias; Pappenheimer bodies are iron-containing inclusions. The distinctive feature of Heinz bodies is their composition—oxidized, denatured Hb precipitates from oxidative stress.

Oxidative stress damages hemoglobin, causing it to denature and precipitate inside red blood cells as small inclusions attached to the inner membrane. These inclusions are Heinz bodies. They form when oxidants convert hemoglobin to a denatured form that aggregates, a situation seen in conditions like G6PD deficiency or after exposure to oxidant drugs. On supravital stains, Heinz bodies appear as round precipitates within the cell. The spleen normally removes these inclusions, which can lead to bite cells when macrophages partially remove them. Other RBC inclusions have different causes and appearances: Howell-Jolly bodies are DNA remnants from splenic dysfunction; basophilic stippling reflects RNA granules seen in lead poisoning and some anemias; Pappenheimer bodies are iron-containing inclusions. The distinctive feature of Heinz bodies is their composition—oxidized, denatured Hb precipitates from oxidative stress.