You should ask the doctor to do 6 to 8 biopsy samples during the endoscopy. That's the recommendation from some medical board altho I forget which one. One sample is not enough, and many doctors will only do one or two unless they are told to do more. Can you look up celiac support groups in your area? They may have ideas for doctors who are familiar with celiac disease. It's best to choose a doctor who is familiar with diagnosing celiac and treating it as many are not up to speed on the current guidelines. There is a doctors sub-section on this forum which might have someone listed for your area also. Try searching that too.