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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.
Medical Definition of RED BLOOD CELL. : any of the hemoglobin-containing cells that carry oxygen to the tissues and are responsible for the red color of vertebrate bloodâcalled also erythrocyte, red blood corpuscle, red cell, red corpuscle; compare white blood cell. any of the hemoglobin-containing cells that carry oxygen to the tissues and are responsible for the red color of vertebrate blood âcalled also erythrocyte, red blood corpuscle, red cell, red corpuscle. See red blood cell defined for English-language learners. See red blood cell defined for kids.