Is best to ask your operative surgeon why they are performing a blood test on you the day before surgery?. In our practice we do not draw any work on patients for a rhinoplasty procedure unless patients have a specific medical condition that warrant that specific testing. When we do blood testing, is usually done three or four weeks ahead of time before the surgery, to sort out any medical issues that might need to be addressed prior to elective cosmetic surgery.
You will most likely have a CBC and Chem panel sent as part of the pre-operative blood testing. An STD or STI panel will likely not be sent. If you are concerned about STD or STI, go to an urgent care or your primary care doctor for testing (not your plastic surgeon). Best of luck.