I have to tell you, I have struggled with similar questions. I think we all want to know, what exactly is wrong with us and how did it happen. Diabetes is in fact very complicated and we are all different. And often, the diagnosis comes down to a judgement call. In the end, once you have progressed to intensive insulin therapy, it doesn't really matter. What really matters is how well you are able to manage your condition.
As to finding the tests I mentioned, c-peptide is usually listed as "Fasting C-Peptide." The antibody tests might appear with a variety of names an abbreviations. The actual names are Glutamic Acid Decarboxylase, Islet Cell Antibodies and Insulin AutoAntibodies. Most endos won't order these tests once you are being treated with insulin, it just doesn't serve any purpose since it won't change your treatment. Many endos routinely order a c-peptide to see whether your insulin production is declining. You can always ask for the tests and see what your doctor says. But even if you come back negative for T1, then so what? And if you actually had diabetes since childhood, maybe you actually had a third form of diabetes called Monogenic Diabetes (or MODY). The tests for MODY are genetic tests, almost never ordered by doctors in the US.
Wow, great info, thanks for sharing. It only matter to me really since my last endo did not want to authorize a pump for me. I have always been considered type 1 but when I persisted, he said well if I have to sign papers for it to go through the govn plan, I will put down your between a type 1 and type 2 and the program is only for type 1. when I asked him why he would do this his answer was because he does not like the pump and he is the only one in the area on call for everyone on one. I no longer have been seeing him have just worked with my GP for the past 4 years. I go to see an endo next month. other than that I take 6+ needles a day test at least 6x a day, my A1C 0.063
thanks again for answering my questions and listing to me mumble. and I am Canadian LOL