MS-1006

MS-1006

A 45-year-old male is recovering from trans-sphenoidal surgery for a non-functioning pituitary adenoma. He reports excessive thirst and increased water intake to the doctors during the ward round, four days after the surgery. The patient’s fluid chart shows a urine output of 7 litres in the past 24 hours, and his blood glucose level is 5.2mmol/L. To confirm the diagnosis, the doctors plan to conduct a water-deprivation test and a vasopressin test.

What are the expected results of the urine osmolality investigations, given the likely diagnosis?