Hi
@Ibby
From what I can see in the photo they are doing a GaD Antibody test. This will check whether he has the antibodies in him whose ‘job’is to destroy the beta cells in the pancreas. These are the ones that would be making insulin. The presence of these antibodies would show that he has T1 Diabetes.
I am a little uncertain what your questions is. Is your OH already on insulin, and are you asking whether he should still take his insulin. His insulin will have no impact on this test. They will be looking for the antibodies.
I do no know what the other tests are.
I hope that makes sense