Review Question - QID 214411

A 52-year-old man presents to the emergency department with blood in his stools. He noticed that a small amount of blood was coating his stools this morning, which has been occurring intermittently for the past few weeks. The patient is otherwise healthy, does not smoke or drink alcohol, and exercises regularly. He has a family history of colon cancer, but both of his parents are still alive. His temperature is 97.9°F (36.6°C), blood pressure is 133/74 mmHg, pulse is 81/min, respirations are 14/min, and oxygen saturation is 98% on room air. Laboratory values are ordered as seen below.

Hemoglobin: 14 g/dL
Hematocrit: 44%
Leukocyte count: 6,820/mm^3 with normal differential
Platelet count: 237,000/mm^3

Physical exam is notable for the finding in Figure A. Otherwise, the patient has guaiac negative stools, and his abdomen is non-tender. Which of the following is the most appropriate next step in management?