question: Please help, My son has Eosinophilic Gastrointestinal Disorder and today was called but to see the doctor who told me that his igA level is low (it was 11). He has been medicated with Ketotifen and the doctor said he would stay on this for a year or more. Can you tell me more about what this means for him and why he has this? Thank you so much, A worried mother.