Endoscopy is an accurate test for diagnosing dyspepsia, but organic pathology that does not respond to acid suppression or Helicobacter pylori eradication therapy is rare under the age of 65. Most guidelines therefore recommend as the first line approach for managing dyspepsia either empirical proton pump inhibitor therapy or a non-invasive test for Helicobacter pylori and then offering therapy if the patient is positive. If the patient has alarm features such as progressive dysphagia, anemia or weight loss, endoscopy may be appropriate.
Sources:
Moayyedi P, Lacy BE, Andrews CN, Enns RA, Howden CW, Vakil N. ACG and CAG Clinical Guideline: Management of Dyspepsia. Am J Gastroenterol 2017;112:988-1013. PMID: 28631728