A 29-year-old woman at 25 weeks of pregnancy presents with right flank pain, rigors and vomiting. Her temperature is 39.2°C, pulse 132/min and blood pressure 92/58 mmHg; urine contains leukocytes and bacteria. Ultrasound shows right hydronephrosis with a 7-mm proximal ureteric calculus. After blood cultures and intravenous antibiotics are commenced, which one of the following is the most appropriate next step?
Keep going — a set of ten like this one, one at a time.
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