<<Disclaimer: Verify this information before applying it to your situation.>> Hi everybody, First I wish to thank all the list members that took their time to reply to my post. Most of the replies had suggested that celiac disease between identical twins is less than 100% , more like 70%. A question was raised as to the importance of genes for celiac disease. Since identical twins are genetically identical. And Celiac disease does have a strong base in genes, something else is needed, some environmental factor to trigger the disease in a genetically susceptible host. There is also a possibility that the twin may not have the disease at this point but may develop it later in life and it may present differently from the other twin. The twin studies serve to illustrate the difference between a disease that is strictly genetic in it nature and one that has a genetic susceptibility. many people can have the genes but never get the disease. I had also recieved suggestions that the tests that my twin sister went through for diagnosis were not accurate, perhaps because the classic Celiac symptoms are not present yet. Some people share their personal situations of sets of twins that both have Celiac Disease in different intensities and symptoms. All the input was great, it was all very helpful and supportive. I thank you all again, Keren in NY