Which Diagnostic Test Is the Most Appropriate for Evaluating Mr. Santos’ Gastrointestinal Bleeding

Mr. Santos, a 55-year-old Male, Presents to the Emergency Department with Complaints of Severe Abdominal Pain and Black, Tarry Stools. He Has a History of Peptic Ulcer Disease. on Physical Examination, He Is Pale and Hypotensive. Laboratory Tests Reveal a Decreased Hemoglobin Level