Q&A column, 9/16
September 2016—We know we can count fewer than 100 cells for a manual differential if there is a very low white cell count. But if the white cell count is very high, should we count more than 100 cells? Some references state that >30,000 WBC/µL require a 200 cell differential, others >50,000 WBC/µL, and many do not mention at all the need to increase above 100 cells counted.