Hello
@Elias DT1 Can you advise what your reasoning is behind the questions, perhaps we can help further ?
There is a genetic test for children of type 1's in the UK to determine if they have a pre-disposition to acquiring the condition. There is also a c peptide test to determine whether the antibodies are present in someone who has been diagnosed with diabetes but their type hasn't been confirmed, this is an important test as some type 1's are misdiagnosed with type 2 and treated with medication which can worsen their situation.
https://www.jdrf.org/t1d-resources/about/diagnosis/