It can easily miss the evidence since most places say that you have to have greater than a score
of 40 to be diagnosed celiac (score
= greater than 40 IEL's [intraepithelial lymphocytes] per unit area). Well, if the normal end of the range ends at 20, and celiac is at 40, what happens between 20-40? Most places call it negative when it's not.
There's a lot of gene linkage between Crohn's and celiac, so you might want to consider trying a gluten-free diet and see if it's of help.