<<Disclaimer: Verify this information before applying it to your situation.>> Greetings!! My Mom (she has celiac, but I have internet access ;-) !) went for her first biopsy approximately 4 years ago, and has been on a GF diet since. Her GI (gastrointernalist??) has ordered followup biopsies later this month....but as far as I know, there won't be a gluten challenge I suspect that he'll also be trying to trace her lactose intolerance, which emerged only recently -- sound familiar?? Leaving my 2 cents at the door.... Wendy Woytasik-Karr University of Windsor