A Myeloperoxidase Stain Is Performed on Peripheral Blood Cells of a Patient

A myeloperoxidase stain is performed on peripheral blood cells of a patient with acute leukemia and 85% blasts; the patient has an occasional mature neutrophil. When the stained slide is evaluated, the blasts are all negative but the mature neutrophils are strongly positive. What is the significance of this finding?

A) The stain worked (internal positive control) .
B) Nothing can be determined until a positive control is also examined.
C) Nothing can be determined because mature neutrophils are always positive.
D) Nothing can be determined because only examination of the blasts is useful.

Correct Answer:

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