I don't live in the US, but based on this thread, I wouldn't risk it:   https://www.reddit.com/r/glutenfree/comments/1n2ehw8/cracker_barrel/   This app is helpful: https://www.findmeglutenfree.com/

I see that Cracker Barrel restaurants have a gluten free menu (not all locations, but one confirmed that they do). I was wondering if it is safe for my 5 year old son with celiac disease? 

I missed that. Good summary.

Welcome to the forum, @Mmoc! Please include the reference ranges for the IGA and the TTG tests in your next post if you have access to them. We cannot comment much otherwise as different labs use different reference ranges for these tests and also different units of measurement. There are no universal standards as of yet so the raw test numbers are not always helpful. Having said that, if your IGA (what we usually call "total IGA") is low, the TTG-IGA score will be skewed and cannot be trusted. Other kinds of tests for celiac disease would need to be run, particularly those in the IGG family of tests. Perhaps this will be helpful:  

Hi there any advice welcomed. I have had 4 years of symptoms ranging from immune related anaphylactic symptom sudden onset food allergy to peppers/paprika/chilli/capsicum family derivatives. all these allergies fizzled out and following a food challenge test in hospital I reintroduced them a few months ago. Since then my digestive system is a mess. i have since noticed that 4 years ago when testing for iga allergies my iga level was .62 and my ttg was less than .1 (due to symptoms I was probably eating very plainly at that time). should I insist on being retested for celiac? I’ve since read two indicators for celiac include: sensitive to spicy foods when in flare up tooth enamel weakness and symmetrical discolouration patches on teeth which I have had since childhood on my two front teeth     thanks