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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.
This test can also give an indirect estimate of the hemoglobin levels in the blood. RBC's are actually Red Blood Corpuscles, (non-nucleated cells). The term corpuscle indicates that it is a mature Red Blood Cell. Once the immature cell has matured, it is then, and only then, capable of carrying oxygen.