On a standard reticulocyte preparation with new methylene blue, 100 cells are counted containing blue-stained granulofilamentous material. The red blood count is 3.22 ยด 1012/L, and the hematocrit is 30%. Calculate the corrected reticulocyte count

a. 1.5%
b. 3.0%
c. 6.7%
d. 15.0%


ANS: C
The corrected reticulocyte count takes "normalizes" the hematocrit to 45%. Thus it is the reticulocyte % x patient's hematocrit/"normal" hematocrit = 10% x (30/45) = 6.7.

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