On a standard reticulocyte preparation with new methylene blue, 100 cells are counted that contain blue-stained granulofilamentous material. The red blood count is 3.22 ยด 1012/L, and the hematocrit is 30%. Calculate the reticulocyte count as a percentage
a. 0.1%
b. 1.0%
c. 10.0%
d. 100.0%
ANS: C
A total of 1000 red cells plus reticulocytes are always counted (and thus is the denominator when performing a reticulocyte count). The reticulocyte count (%) = (100/1000) ´ 100 = 10%.
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