Here in Australia most specialists and GP's don't put much faith in the blood tests as i have been told by all of them (the ones i see or have seen) that they are all too inaccurate for a diagnosis. I have also read with regards to the biopsy, in Australia they now view no villi damage BUT hight lymphocyte levels as early celiac disease. The basis being while there are some other things that cause villi blunting, none of them cause BOTH villi blunting and high lymphocyte levels other than celiac.
Just in my family there are 4 biopsy diagnosed celiacs with positive gene tests. Only one of us had a + blood test. My current GP said she wont even bother with the blood tests anymore she just refers straight to the GI specialist for biopsy. Her method is "if you are going to rule something out, you have to rule it out, not guess it out. The blood tests are guessing" in her opinion