Tummy tuck is a very safe procedure when performed by qualified plastic surgeon and monitored by a good anesthesiologist. It has very low risks and complication rates. Normally for elective surgery (including tummy tuck), my patients get blood count, urine analysis, and pregnancy test. If a patient takes a high blood pressure medications, she/he will need chemistry (electrolytes) checked. Preop lab/tests depend on each patient's medical history. As long as you are healthy, blood count, urine analysis, and pregnancy test should be sufficient.
For a healthy young person, the only routine lab ordered may be a pregnancy test for females. Other tests might be ordered based on a patients medical history, and medications being taken. Men over 45 might be asked to get an EKG, women over 50 the same. Older patients getting a TT may also have a blood count checked. All the best.