How is gastritis diagnosed?

Your doctor will review your personal and your family medical history and perform a thorough physical evaluation. Your doctor may recommend any of these tests to diagnose gastritis:

  • Endoscopy. The doctor eases an endoscope, a thin tube containing a tiny camera, through your mouth and down into your stomach to look at the stomach lining. The doctor will check for inflammation and may perform a biopsy, a procedure in which a tiny sample of tissue is removed and then sent to the laboratory for analysis.
  • Blood test. The doctor may check your red blood cell count to learn if you have anemia, which means that you do not have enough red blood cells.
  • Stool test. This test checks for blood in your stool, which is a sign of gastritis.

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