<<Disclaimer: Verify this information before applying it to your situation.>> The rectal biopsy is a fairly new technique that is starting to show some promise. At least one physcian (Dr Michael Marsh in Great Britian) is almost ready to publish data on the realiability of this technique. Until his paper is published this year, I can only make a guess as what type of damage is being being looked for. This test does not look for the classic damaged villi. Michael Jones ([log in to unmask]) Living a wonderful, GF life in Orlando, FL