You must have a stable relationship with a primary care physician who has been treating you continuously for one year prior to consideration for surgery. You must have a dietician evaluation. You must have a psychological evaluation. Patients with bipolar disease are generally excluded from consideration for surgery. If you have a history of heart disease, if you've taken Fen-Phen in the past, if you're over the age of 50, or other cardiac risk factors, you'll require an echocardiogram. At some point prior to surgery, you'll have to undergo a chest x-ray, an EKG and blood tests.