My DS never had any abnormal tests results aside from low IGg levels. CBC, EEG, MRI, Cat scan, even strep titers. His titers weren't even high when he had strep. I always thought it was unusual. Then my daughter started getting sick and the doctor checked her for h. pylori and she was positive. Our whole family was treated and we have seen significant improvement in our DS. He had very high anxiety. I'm wondering if we were fighting the wrong infection. Anyway, my point is that I think it doesn't hurt to check for bacterial infections of the stomach. They can affect your immunity. Probably the reason I also had low IGg.