A 30-year-old man who sustained a head injury from a motorcycle accident is in the intensive care unit. His computerized tomography scan revealed mild cerebral edema. On the second day in the unit, he began having large urine output. What other manifestations would support a diagnosis of diabetes insipidus?
A) A low plasma osmolality
B) A high urine osmolality
C) A high plasma osmolality
D) Hyponatremia

Question

Quizplus · Accepted Answer

Diabetes insipidus is characterized by an inability to concentrate urine, leading to high plasma osmolality due to excessive water loss and low urine osmolality.

A 30-Year-Old Man Who Sustained a Head Injury from a Motorcycle