A client with pernicious anemia takes supplemental folate and self-administers monthly vitamin B2 injections. The client reports feeling increasingly fatigued. Which laboratory value should the nurse review?

A. Serum electrolytes: Electrolytes reflect fluid and metabolic balance but do not directly indicate the effectiveness of therapy for pernicious anemia. Reviewing electrolytes would not explain worsening fatigue related to impaired red blood cell production. B. Platelet count: Platelets are important for clotting, but their level does not provide information about anemia or oxygen-carrying capacity. A normal or abnormal platelet count would not clarify the client’s increasing fatigue. C. Complete blood count: A CBC provides essential information about hemoglobin, hematocrit, and red blood cell indices. These values reflect whether vitamin B12 therapy is effectively treating the anemia, which may present with fatigue. D. Liver enzymes: Liver function tests are useful in detecting hepatocellular injury or dysfunction. They are not directly related to the management or monitoring of pernicious anemia and would not explain the client’s current symptoms