There is no direct referral into the bariatric surgical service. All patients who wish to be considered for bariatric surgery are required to successfully complete the Core 12 week Tier 3 programme in the weight management service. The weight management service can then refer patients to the surgical service. Inclusion and exclusion criteria for the bariatric service can be found on the Bariatric (Weight Loss) Surgery Service pages on the NHS Lothian Intranet.