What are the tests for barrett's esophagus?

Endoscopy. An endoscopy and biopsy is needed to assess the barrett's and decide if there are precancerous cells that require more aggressive therapy.
Barrett's. This is a change in the lining of the esophagus in response to longstanding reflux. It is a precancerous change which requires frequent surveillance EGDs to make sure cancer is not developing. If Barrett's is found, the abnormal areas can be ablated so that they do not progress to cancer.