Which of the following is found in megaloblastic macrocytosis but not in nonmegaloblastic macrocytosis? A) Decreased WBC count and vitamin B₁₂ levels B) Decreased hemoglobin and hematocrit C) Normal-to-decreased reticulocyte count D) Increased serum bilirubin

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Megaloblastic macrocytosis is characterized by decreased WBC count and vitamin B12/folate levels, which are not typically seen in nonmegaloblastic macrocytosis. Decreased hemoglobin and hematocrit can be seen in both types of macrocytosis, while a normal-to-decreased reticulocyte count and increased serum bilirubin are not specific to either type.

Which of the Following Is Found in Megaloblastic Macrocytosis but Not