Patients with ovarian torsion often present with sudden onset of sharp, usually (bilateral/unilateral) lower abdominal pain.
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A 20-year-old woman comes to the emergency department because of sharp, non-radiating, left lower quadrant pain that has progressed in intensity over the last four hours. She has nausea but denies diarrhea, urinary symptoms, or vaginal discharge. Her temperature is 37°C (98.6°F), pulse is 120/min, respirations are 26/min, and blood pressure is 130/80 mmHg. Pulse oximetry in room air shows an oxygen saturation of 99%. Physical examination shows left lower quadrant tenderness with guarding. Pelvic examination shows left adnexal tenderness without cervical motion tenderness or discharge. A urine pregnancy test is negative. Which of the following is the most appropriate next step in management?