My son 2.4 ASD has been gluten free for about a month now. The paed ordered the most basic of tests and the nutritionist with a doctor has said that I should have had a celiac test before going Gluten free.. The doctor said I should give him little gluten everyday for a week or more then get him tested for the antibodies to show. This might sound thick but I didn't ask at the time -how much is a little bit? Should I give him a slice of bread or a spoonful of porridge? Ive no idea. Dont want to overdo it and undo the diet completely.