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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.
Hematocrit, also known as PCV (packed-cell volume), is the concentration of red blood cells in the blood. The higher hematocrit is, the greater the percentage of red blood cells in the blood, while lower hematocrit levels signify a lower percentage of red blood cells.