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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 hemoglobin count indicates an above-normal level of hemoglobin in your blood. Hemoglobin (often abbreviated as Hb or Hgb) is the oxygen-carrying component of red blood cells. A high hemoglobin count is somewhat different from a high red blood cell count, because each cell may not have the same amount of hemoglobin proteins. Therefore, you could have a high hemoglobin count even if your red blood cell count falls within the normal range. The threshold for a high hemoglobin count is slightly different from one medical practice to another.