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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.
The definition of a high red blood cell count varies from one medical practice to another. A normal range in adults is generally considered to be 700,000 to 5.2 million red blood cells per microliter (mcL) of blood for men and 500,000 to 4.6 million red blood cells per mcL of blood for women. In children, the threshold for high red blood cell count varies with age and sex.