Normally they take about 6 samples in a biopsy. One sample is not enough. If you don't mind me asking do you know what Celiac Test you were positive on? Also, I believe Reflux is common in Celiacs. You may want to google that. You should not be gluten free prior to a biopsy, you need to remain on a Gluten diet. You might consider finding another GI more familiar with Celiac Disease. Best wishes.
I was a strong positive on the Tissue transglutaminase and moderate positive on the deamidated gliadin. Can other things cause these to be high?