A nurse is caring for several clients at risk for shock. Which laboratory value requires the nurse to communicate with the primary health care provider?

A. Lactate: 5.4 mg/dL: An elevated lactate level is a critical indicator of tissue hypoperfusion and anaerobic metabolism, often associated with sepsis or other forms of shock. A level of 5.4 mg/dL suggests significant hypoxia at the cellular level. Elevated lactate requires prompt communication with the provider to initiate rapid assessment and interventions. B. White blood cell count: 11,000/mm³ (11 x 10³/µL): A WBC count of 11,000 is slightly above the normal adult range (4,500–11,000/mm³). While it may indicate early infection or stress response, it is not immediately critical in the context of shock and does not require urgent notification by itself. Trends and associated clinical signs guide further action. C. Sodium: 150 mEq/L (150 mmol/L): Mild hypernatremia may occur due to dehydration or fluid shifts. Although it warrants monitoring and correction, it is not an immediate life-threatening value in the acute setting of shock compared with lactate, which directly reflects tissue perfusion. D. Creatinine: 0.9 mg/dL: A creatinine of 0.9 mg/dL is within normal limits (approximately 0.6–1.3 mg/dL for adults) and indicates normal kidney function. This value does not require urgent intervention in a client at risk for shock.