A 23-year-old female presented at 30 weeks of gestation with generalized weakness and fatigue for two weeks. She had no significant past medical history.
Examination showed polyuria and polydipsia. Physical examination Blood pressure: 122/66 mmHg Heart rate: 72 beats per minute Fundus height: Consistent with 30 weeks of gestation Laboratory examination WBC 6.5 cells/uL Platelets 350 Hemoglobin 13 g/dL Sodium 135 mmol/L Potassium 1.6 mmol/L Chloride 115 mmol/L Bicarbonate 14 mmol/l BUN 2 mg/dL Creatinine 0.7 mg/dL Glucose 74 mg/dL Albumin 2.5 gm/dL Calcium 8.7 mg/dL Magnesium 2.1 mEq/L Corrected serum anion gap of 10.55 Blood gas pH of 7.33 pCO 2 25 mmHg pO 2 110 mmHg Bicarbonate 13.2 mol/L Urine studies pH-5 Urine anion gap of −1 Urine sodium 80 mmol/L Urine potassium 40 mmol/L Urine chloride 121 mmol/L Transtubular potassium gradient - 18 Serum osmolality 275 mosm/dL/L Urine osmolality…
