A client was admitted 36 hours ago for a head injury that occurred as the result of a motorcycle accident. In the last four hours, the client's urine output has increased to over 200 mL/hour. Before reporting the finding to the healthcare provider, which intervention should the nurse implement?

Rationale: A. Obtain capillary blood samples for glucose every 2 hours: Monitoring blood glucose is important in critically ill clients, but increased urine output after a head injury is more suggestive of a possible neuroendocrine issue rather than hyperglycemia. B. Measure oral secretions suctioned during last 4 hours: Suctioned oral secretions reflect airway management but do not provide information about renal function or causes of polyuria. This intervention does not help evaluate the sudden increase in urine output. C. Obtain blood pressure and assess for dependent edema: While vital signs and fluid status are relevant, they alone do not determine the etiology of polyuria. Dependent edema is less likely in acute post-head injury scenarios causing high urine output. D. Evaluate the urine osmolality and the serum osmolality values: Assessing urine and serum osmolality helps differentiate between causes of polyuria, such as diabetes insipidus, which can occur after head trauma. This evaluation provides objective data needed before reporting to the healthcare provider and guiding management.