单选题 Which abnormal laboratory value is most indicative of aplastic anemia?
A. A decreased hemoglobin.
B. An elevated white blood cell count.
C. An elevated red blood cell count.
D. A decreased erythrocyte sedimentation rate.

【正确答案】 A

【答案解析】A decreased hemoglobin is indicative of aplastic anemia. In addition to a decreased hemoglobin and red blood cell count, the client will also have a decreased white blood cell count and decreased platelets.