The number of nucleated red blood cells (NRBCs) is counted while performing a 100 cell white cell differential.


If 0-4 NRBCs are counted, no correction of the WBC is required.


If 5 or more NRBCs are counted, then the corrected WBC=

= ((instrument WBC per µL) * 100) / ((nucleated RBCs) + 100)


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