A 28-year-old male presents to the emergency department 20 minutes after a high-speed motor vehicle collision. On primary survey, he is alert and oriented, airway patent, breathing at 24/min with clear bilateral breath sounds, heart rate 110/min, blood pressure 128/82 mmHg. Abdomen is soft but tender in the left upper quadrant with guarding. Pelvis is stable. During secondary survey, you note a 3 cm laceration over the left 10th intercostal space with minimal bleeding. What is the most appropriate next step in the management of this patient?