Sam is a 19 year old university student who is concerned that he may have Coeliac disease. He sometimes gets bloated and gets abdominal cramps on the days he eats foods that contain gluten. As a result, he has cut gluten out of his diet completely for the last 2 months and feels that his symptoms are much better. You explain that the Coeliac blood test is only accurate if there is some gluten in the diet and he agrees to re-introduce it.
Which one of the following statements is most correct regarding this?