A 48 year-old male presents to the office with the complaints of nausea, epigastric pain and watery diarrhea. Past medical history reveals a jejunal ulcer which was treated with proton pump inhibitors six months prior. Physical examination reveals normal bowel sounds and epigastric tenderness to palpation. Laboratory analysis is remarkable for elevated chromogranin A. Also a serum gastrin level is equivocal. The most appropriate next diagnostic step is?
- basal acid output
- chromogranin A
- secretin stimulation test
- somatostatin receptor scintigraphy
- urease breath test
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