Review Question - QID 109953

A 55-year-old man presents to urgent care for weakness and weight loss. For the past several months, he has felt progressively weaker and has lost 25 pounds with intermittent abdominal pain. The patient has not seen a physician in 30 years and recalls being current on most of his vaccinations. A few years ago, he went to the emergency department due to abdominal pain and was found to have increased liver enzymes due to excessive alcohol use and incidental gallstones. The patient has a 50 pack-year smoking history. His temperature is 99.5°F (37.5°C), blood pressure is 161/108 mmHg, pulse is 90/min, respirations are 17/min, and oxygen saturation is 95% on room air. Physical exam reveals an emaciated man. The patient has a negative Murphy sign and his abdomen is non-tender. Cardiopulmonary exam is within normal limits. Which of the following is the most appropriate next step in management?