A 55-year-old man is admitted to the ICU with an upper GI bleed. Urgent endoscopy demonstrates a duodenal ulcer with recent stigmata of bleeding. He reports using NSAIDs occasionally for back pain and he takes a daily PPI for heartburn. Which of the following would be the recommended method to check for Helicobacter pylori?
A. Rapid urease testing (CLO test)
B. Fecal antigen test
C. Serology antibody testing
D. Urea breath testing
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