What is the hallmark laboratory finding in chronic myeloid leukemia?

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Decreased alkaline phosphatase activity in granulocytesLowered acid phosphatase levels in granulocytesComplete absence of plateletsTotal deficiency of neutrophils

Explanation

The key diagnostic feature of chronic myeloid leukemia is a reduction in alkaline phosphatase activity within granulocytes. Other options such as decreased acid phosphatase, absence of platelets, or lack of neutrophils are not characteristic of this condition.