Great news came in today! Bertrand's DNA test came back negative. His condition is NOT ataxia telangiectasia. :) This is a huge relief for us. I will be speaking with Dr. Samson-Fang again tomorrow to discuss next steps.
Since AT was why his gastroenterologist was shrugging off the case, now that it has been ruled out maybe now Dr. Book will show some interest. We'll likely be getting new blood work drawn either Friday or Monday.