The red cell histogram is wider than normal. Which of the following is true?
a. The red blood cell distribution width (RDW) is decreased.
b. Most cells are larger than normal.
c. The coefficient of variation was calculated incorrectly.
d. Anisocytosis is present.
ANS: D
The coefficient of variation of the red cell histogram is the RDW. Thus when the histogram is broader than usual, the RDW increases.
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