When is it advisable to count 200 instead of 100 white cells for a differential?
a. The technologist is inexperienced.
b. The physician requests it.
c. The white blood count is elevated.
d. The white blood count is decreased.
ANS: C
Accuracy is always improved when more cells are counted; however, for normal white cell counts, it is not practical to count more than 100 white cells. However, when the white count is significantly elevated (>40.0 ´ 109/L), 200 white cells should be counted and differentiated.
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