Review Question - QID 214398

A 33-year-old man presents to the emergency department with bloody emesis. He states that it started last night after drinking and has persisted until today. The patient is homeless and has a past medical history of IV drug abuse, hepatitis C, and alcohol abuse. The patient is vomiting bright red blood in the emergency department but stops after receiving a dose of ondansetron. His temperature is 99.3°F (37.4°C), blood pressure is 102/78 mmHg, pulse is 127/min, respirations are 14/min, and oxygen saturation is 99% on room air. Physical exam is notable for the finding in Figure A. Ultrasound reveals fluid in the abdomen, and rectal exam reveals a guaiac positive sample. The patient is speaking in complete sentences and is well appearing. He is started on IV fluids. His INR is 1.7. Which of the following is the most appropriate initial step in management?