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A 23-year-old male presents with complaints of polydipsia and frequent, large-volume urination. Laboratory testing does not demonstrate any evidence of diabetes; however, a reduced urine osmolality of 120 mOsm/L is measured. Which of the following findings on a desmopressin test would be most consistent with a diagnosis of central diabetes insipidus?
Reduction in urine osmolality to 60 mOsm/L following vasopressin administration
Reduction in urine osmolality to 110 mOsm/L following vasopressin administration
Increase in urine osmolality to 130 mOsm/L following vasopressin administration
Increase in urine osmolality to 400 mOsm/L following vasopressin administration
No detectable change in urine osmolality following vasopressin administration
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