1 MCQs in Medicine for NEET PG
A 38-year-old man presents with a 4-week history of polyuria, polydipsia, and nocturia. Serum sodium is 152 mEq/L, serum osmolality is 310 mOsm/kg, and urine osmolality is 180 mOsm/kg despite hypernatremia. A water deprivation test shows no change in urine osmolality. Following desmopressin (DDAVP) administration, urine osmolality increases to 650 mOsm/kg. What is the most likely diagnosis?
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