What tests are done to confirm diabetes?

So we do for especially, you know, for all of them, just to confirm the diagnosis, we check their glucose levels. So we check their antibodies, we call them GAD antibodies, islet antibodies. Nowadays, we do this test called C-peptide, can be paired with glucose, because that can form the diagnosis. C-peptide tells us how much insulin your dead body is producing insulin. Sometimes if we have not done the test and we are only going by the clinical symptoms, and we think it's type two, actually, if we done the C-peptide and it's low, and then we can still preserve some of their pancreas if we start insulin at the initial stage. So these are the main, so at that time we do, we do also liver function tests. We also do celiac screen to confirm they don't have a celiac disease. We also do thyroid functions. All these, and then the liver functions, so making sure all these other functions, lipids also we do, the cholesterol. So we see, because it's a, especially type 2 diabetes is a metabolic syndrome. If they already have a high cholesterol, if they already have raised liver functions, so that means they already have that physiology which can lead to type 2 diabetes. And then we can treat them as well. So sometimes these antibodies, islet cell and GAD antibodies are negative, but the C-peptide is low, that confirm they do need insulin their type 1 diabetes. So that's why all these tests are very important. Do you still use the glucose tolerance test and the HbA1c? We do HbA1c, but glucose tolerance test, I haven't seen that. It's not that popular anymore.