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Review Question - QID 108121

QID 108121 (Type "108121" in App Search)
A 26-year-old female complains of frequent, large volume urination. This negatively affects her sleep, as she has to frequently wake up at night to urinate. She also complains of increased thirst. Her past medical history is significant for bipolar disorder that is treated with lithium for 3 years. Serum osmolality is 425 mOsm/kg, and urine osmolality is 176 mOsm/kg. Which of the following best explains this patient’s serum and urine osmolality?