What does it consists of?

This is a question for post-ops. I'm due for surgery September 29. The closer the date gets, the more nervous and scared I get. I go for my pre-op testing in the morning. I was told to arrive at 7:15 a.m. and expect to be there until 1:00 p.m. What in the world are they going to do to me for that many hours? I know I have to take a blood test and ekg, but what else is involved. They can eliminate the gall bladder test because I don't have one. I had gallstones many years ago and they removed my bladder. This is probably a silly question, but what does blood testing have to do with surgery? I mean, how does your blood tell a surgeon whether you can have surgery or not? I would appreciate your help and support. Many thanks.

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