Home Testing Kits For Celiac? in Celiac Disease Pre-Diagnosis, Testing & Symptoms Posted August 24, 2012 · Report to Admin I just took this and got a negative, I have been gluten free for two weeks but have been eating gluten since last night (and think I accidentally did a few times in the two weeks). Should the test be accurate if I have been eating it since last night, or was I too quick, do I still need to wait two weeks, or can I say it's intolerance now not celiac? The home tests are better for finding celiac than for ruling it out. TTG tests are 80% accurate. There is still a 20% chance that you are celiac so no, you shouldn't assume you are intolerant.