In canine patients, which cell type is considered a nonnucleated immature erythrocyte found in peripheral blood?

In canine patients, which cell type is considered a nonnucleated immature erythrocyte found in peripheral blood?

• A. Reticulocyte
• B. Metarubricyte
• C. Rubriblast
• D. Rubricyte

Answer: (A)

In this context, the cell type being tested is the one that represents an immature red blood cell that has shed its nucleus but still circulates in the blood. That is a reticulocyte. Reticulocytes are released from the bone marrow as immature erythrocytes and lack a nucleus, though they retain residual RNA that can be seen with special stains. This makes them the circulating nonnucleated immature erythrocytes, and their presence and quantity in dogs reflect the bone marrow’s response to anemia (a regenerative response). The other options are nucleated erythroid precursors that normally reside in the bone marrow and are not the nonnucleated form found in peripheral blood. Rubriblast and rubricyte are early and intermediate nucleated stages, while metarubricyte is a late nucleated stage. Because they still contain nuclei, they do not fit the description of a nonnucleated immature erythrocyte circulating in the blood. Therefore, reticulocyte is the best answer.

In this context, the cell type being tested is the one that represents an immature red blood cell that has shed its nucleus but still circulates in the blood. That is a reticulocyte. Reticulocytes are released from the bone marrow as immature erythrocytes and lack a nucleus, though they retain residual RNA that can be seen with special stains. This makes them the circulating nonnucleated immature erythrocytes, and their presence and quantity in dogs reflect the bone marrow’s response to anemia (a regenerative response).

The other options are nucleated erythroid precursors that normally reside in the bone marrow and are not the nonnucleated form found in peripheral blood. Rubriblast and rubricyte are early and intermediate nucleated stages, while metarubricyte is a late nucleated stage. Because they still contain nuclei, they do not fit the description of a nonnucleated immature erythrocyte circulating in the blood. Therefore, reticulocyte is the best answer.