It involves passing a thin, flexible tube (an endoscope) with a camera through into your stomach and the 1st section of the small intestine (duodenum). This is a test to look inside your stomach directly and see whether you have a stomach ulcer. pylori, you'll need treatment to clear it, which can heal the ulcer and prevent it returning. ![]() pylori bacteria (antibodies are proteins produced naturally in your blood and help to fight infection) this has now largely been replaced by the stool antigen test
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