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Review Question - QID 109763

QID 109763 (Type "109763" in App Search)
A 56-year-old woman presents to the emergency department with muscle weakness. Her symptoms have progressively worsened over the course of 2 weeks and are most significant in her lower extremities. She also notices increased urinary frequency. Approximately 1 month ago, she was diagnosed with calcium phosphate nephrolithiasis. Medical history is significant for rheumatoid arthritis diagnosed approximately 10 years ago and treated with methotrexate as well as type 2 diabetes mellitus treated with metformin. Her temperature is 98.6°F (37°C), blood pressure is 138/92 mmHg, pulse is 92/min, and respirations are 17/min. On physical exam, there is mild tenderness to palpation of the metacarpophalangeal and proximal interphalangeal joints. There is 4/5 power throughout the lower extremity. Laboratory testing is shown.

Serum:
Na+: 137 mEq/L
Cl-: 106 mEq/L
K+: 2.9 mEq/L
HCO3-: 18 mEq/L
Glucose: 115 mg/dL
Creatinine: 1.0 mg/dL
Urine pH: 5.6

Which of the following is the most appropriate next step in management?