A nurse is caring for a client Who has diabetes insipidus and is receiving vasopressin. The nurse should identify Which of the following findings as an indication that the medication is effective?

The correct answer is B: A decrease in urine output. Vasopressin is a hormone that helps regulate water balance in the body by reducing urine output. In diabetes insipidus, there is excessive urination due to the inability to concentrate urine, which can lead to dehydration. By administering vasopressin, the nurse would expect to see a decrease in urine output, indicating that the medication is effectively helping the body retain water and reduce excessive urination.

A: A decrease in blood pressure is not a direct effect of vasopressin in this context.
C: A decrease in specific gravity may indicate improved urine concentration but is not a direct indicator of vasopressin effectiveness.
D: A decrease in blood sugar is not a relevant finding in the context of diabetes insipidus and vasopressin administration.