A cloudy cerebrospinal fluid (CSF) is diluted 1:20. In nine large squares, 99 white cells are counted. What is the total white blood count/mm3 or /mL?
a. 99
b. 1980
c. 2200
d. 22,000
ANS: C
The same formula used for calculating manual cell counts in blood is used for body fluids. Thus this cell count = (99 ´ 20)/(9 mm2 ´ 0.1 mm) = 2200/mL.
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