Which of the following red blood cell (RBC) findings are specific for a certain condition as opposed to being nonspecific and found in many conditions?
a. Ovalocytes
b. Poikilocytosis
c. Sickle cells
d. Burr cells
ANS: C
Many different abnormally shaped RBCs are not specific for any one cause for anemia. One exception is the sickle cell, which is almost diagnostic for sickle cell disease.
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