A patient has a leukocyte alkaline phosphatase score of 9. The positive control is 5. Select the correct interpretation
a. Chronic myelogenous leukemia
b. Acute lymphocytic leukemia
c. Polycythemia vera
d. Test must be repeated
ANS: D
Positive controls should always be run with any cytochemical stain to assure that the stain worked. The positive control in this case is essentially negative (score of 5), so the stain must be repeated.
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