Q. A 40-year-old male presents to the emergency department with severe colicky pain in the right lower abdomen that radiates to the groin. The pain began suddenly a few hours ago and has been coming and going in waves. He also reports nausea and occasional vomiting. On physical examination, his BP is 130/80 mm Hg, HR is 98 bpm, RR is 18/min, Temp is 98.7°F, and SpO2 is 99% on room air. Abdominal examination reveals mild tenderness over the right costovertebral angle without rebound tenderness or guarding. No distension, masses, or hernias are noted. Normal bowel sounds are present. Urine analysis reveals the presence of hematuria with RBCs >10/hpf and is negative for leukocytes, nitrites, and bacteria. Complete Blood Count is within normal limits, with normal white blood cell count. Blood Urea Nitrogen and Creatinine are slightly elevated. Serum electrolytes are within normal limits. What is the most appropriate next step in management?