A nurse is caring for a client who has generalized petechiae and ecchymoses. The nurse should expect a prescription for which of the following laboratory tests?

A. Potassium level: Potassium measurement is used to assess electrolyte balance and kidney function, but it does not provide information about platelet function or clotting ability. It is not relevant for evaluating petechiae or ecchymoses. B. Prealbumin: Prealbumin is a marker of nutritional status and protein intake. While important for overall health, it does not help identify the cause of bleeding disorders or thrombocytopenia. C. Creatinine clearance: Creatinine clearance assesses renal function and is unrelated to platelet levels or coagulation abnormalities. It would not provide diagnostic information for clients presenting with bleeding manifestations. D. Platelet count: A platelet count is essential for evaluating clients with generalized petechiae and ecchymoses because these signs suggest thrombocytopenia or platelet dysfunction. Measuring platelet levels helps determine the severity of the disorder and guides further diagnostic and therapeutic interventions.