Diabetes insipidus and SIADH Quiz: Ace Your Exams
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A 30 year-old woman comes to her primary care physician because of muscle cramps, nausea, and fatigue. The patient endorses a history of depression and seizure disorder, both of which are currently managed with medications. Family history is notable for Addison disease in her maternal uncle. Temperature is 36.9°C (98.4°F), pulse is 75/min, respirations are 14/min and blood pressure is 115/80 mmHg. Cardiac, pulmonary, and abdominal examinations are noncontributory. Additional laboratory results are as follows:
Which of the following is the most likely explanation of the patient’s symptoms?
| Laboratory value | Result |
| Sodium | 122 mEq/L |
| Potassium | 3.7 mEq/L |
| Creatinine | 0.9 mg/dL |
| Glucose | 102 mg/dL |
| Serum osmolality | 240 mOsm/kg |
| Urine osmolality | 445 mOsm/kg |
Which of the following is the most likely explanation of the patient’s symptoms?
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