Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Barrett esophagus ?
    ### Response:
    How is Barrett esophagus diagnosed? Esophagogastroduodenoscopy (EGD) with a biopsy is the procedure of choice for confirming a diagnosis of Barret esophagus. A diagnosis is often made while investigating other conditions such as gastroesophageal reflux disease (GERD).
    