Yes, accredited hospitals in Turkey follow strict pre-operative protocols before performing gastric sleeve or gastric bypass surgery. The day before your operation, you undergo comprehensive blood panels, a chest X-ray, an abdominal ultrasound, an ECG and cardiology consultation, pulmonary function tests, an upper GI endoscopy under sedation by a gastroenterologist, and evaluations by both an internal medicine specialist and the anesthesiologist. Surgery only proceeds once all specialists give medical clearance.