What are RBCs that contain iron-stained granules termed?

RBCs that contain iron-stained granules are termed siderocytes. These cells are indicative of the presence of iron deposits within red blood cells, typically seen in conditions such as sideroblastic anemia or in the presence of iron overload. Siderocytes can be visualized using special staining techniques, such as the Prussian blue stain, which highlights iron deposits.

The presence of these granules suggests that there's an abnormality in heme synthesis, which is why recognizing them can be significant in diagnosing certain hematological disorders. The accumulation of iron in the form of granules within RBCs affects their function and can provide clinicians with important insights into a patient's iron metabolism and related conditions.