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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.
What does a high red blood cell count mean. A high red blood cell count (a condition called polycythemia), indicates an excess of red blood cells circulating in your bloodstream. Red blood cells (erythrocytes, or RBCs) are produced in your bone marrow and transport oxygen from your lungs to tissues throughout your body.hat 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. A low RBC count may indicate bleeding, kidney disease, bone marrow failure (for instance, from radiation or a tumor), malnutrition, or other causes.