I doubt it is necessary for everyone to have these tests as routine. Maybe just for those presenting with symptoms or those who don't fit the "type". I was diagnosed T2 on a routine health check. I had zero symptoms. I was fit and well. (or so I thought). My diagnostic tests weren't drastic. I asked my nurse on my first appointment how she knew I was T2. She said because my levels were too low for T1 and if I were T1 they would be higher and I would be feeling quite poorly with diabetic symptoms.