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A nucleated red blood cell, or NRBC, is a red blood cell (RBC) that retains nucleus. Normally, NRBCs are only found in the circulation of fetuses and newborn infants. nucleated red blood cell, or NRBC, is a red blood cell (RBC) that retains nucleus. Normally, NRBCs are only found in the circulation of fetuses and newborn infants.
A high red blood cell count is also called erythrocytosis (uh-rith-roh-sie-TOH-sis). A high red blood cell count means your body is producing too many red cells and is symptom, not a disease in of itself. What does a low red blood cell count mean. If the RBC count is low (anemia), the body may not be getting the oxygen it needs.