Need Advice Regarding Gluten Challenge And Timing Of Endoscopy (Urgent!) in Celiac Disease Pre-Diagnosis, Testing & Symptoms Posted January 27, 2012 · Report to Admin One question on the topic of zonulin: it seems like I could have a blood test to check my levels, and if it's celiac, it seems like my levels would be conspicuously high. If it isn't celiac, my levels would be much, much lower even if slightly elevated. Do you know if anyone is using this type of testing to infer celiac? If my endo comes back negative, then I think my plan will be to: 1- test total iGa to determine if I have a deficiency 2- ask for a zonulin levels check 3- get the genetic test and 4- do the enterolab stool test. Between all of them, I feel like I could reach a definitive conclusion as to whether this is celiac or gluten sensitivity. Any thoughts on this plan?