Q. A 54-year-old male patient presents to the outpatient department with the complaint of recurrent episodes of abdominal pain and diarrhea. He describes the pain as cramping, intermittent, and located in the mid-abdomen, associated with diarrhea but not related to meals. He also reports flushing and mild wheezing, particularly after large meals. On further inquiry, he also discloses that he has lost around 10 pounds of weight over the past 6 months without any dietary or lifestyle changes. On physical examination, there is mild tenderness in the umbilical region with no palpable mass or hepatosplenomegaly. Heart and lung examination is normal. Laboratory investigation reveals normal complete blood count and liver and renal function tests. However, the 5-Hydroxyindoleacetic Acid (5-HIAA) test shows elevated levels in the 24-hour urine collection, recording 25 mg/24 hr. What is the next best step in the management of this patient?