Mine was really straight forward. They took my height, weight, checked my blood pressure and heart rate. I didn’t have any blood taken but I know some girls have said they did. You get asked about 100 health questions about whether you’ve ever had problems with your heart or kidneys for example. Then I was just given the chance to have an informal chat with the nurse about any worries or questions I had. All in all its just to check that you’re fit and ready for your surgery. Good luck x