The bone marrow of a patient with acute leukemia is stained with the periodic acid–Schiff (PAS) stain. When this stain is evaluated, segmented neutrophils show diffuse pink staining. Select the correct interpretation
a. The patient has acute lymphoblastic leukemia.
b. The patient has acute myeloid leukemia.
c. The stain did not work.
d. No conclusion can be reached; blast cells must be examined.
ANS: D
The fact that mature neutrophils stain positive has no diagnostic significance in a patient with acute leukemia. Only examination of the blast cells is useful.
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