Q. A 52-year-old businessman has presented to the clinic with complaints of persistent upper abdominal discomfort for the last 4 months. The pain is usually dull, primarily after meals, sometimes waking him up at night. He also reports symptoms of bloating, heartburn, nausea, and unintentional weight loss of 5 kilograms over the past 3 months. He mentioned a few episodes of dark, tarry stools. He has a history of non-steroidal anti-inflammatory drug (NSAID) use for chronic back pain, but recently discontinued due to his current symptoms. On physical examination, he appears pale and fatigued. His abdomen is soft with mild epigastric tenderness. No distension, guarding, or rebound tenderness is noted. Laboratory investigations show hemoglobin of 10.5 g/dL, Mean Corpuscular Volume (MCV) of 80 fL, and serum ferritin of 20 ng/mL. Upper gastrointestinal endoscopy has been planned. Based on the findings, what is the most appropriate next step of management?