National Institute of Health (NIH 1991, Update 2011)
The indication for bariatric surgery in an adult is a BMI >40 or BMI >35 with a serious health problem linked to obesity. These guidelines were updated in 2011 for adolescents (age >13 for girls and >15 for boys) wherein the indication was BMI >40 with serious health problems linked to weight with failed attempt at weight loss with conservative measures like diet and exercise for at least 6 months. Also it stressed the fact that the patients need to be committed to a healthy and active lifestyle.
Obesity Surgery Society of Australia and New Zealand (OSSANZ: 2008)
The indication for bariatric surgery is a BMI >40 or BMI >35 in the presence of severe obesity-associated complications. Surgery is recommended for patients with an age of >15 years. This guideline recommends against bariatric surgery for adolescents under the age of 14 years, pregnant or breast-feeding adolescents, significant cognitive disabilities, untreated or untreatable psychiatric or psychological disorder and Prader-Willi syndrome and other similar hyperphagic conditions.
American Society for Metabolic and Bariatric Surgery (ASMBS: 2013)
The indication for bariatric surgery is a BMI >40 without coexisting medical problems or BMI >35 with one or more severe obesity-related comorbidities. In patients with BMI of 30-34.9 with diabetes or metabolic syndrome, bariatric procedure may also be offered.
International Federation for the Surgery of Obesity: European Chapter (IFSO-EC: 2014)
The indication for bariatric surgery is a BMI >40 or BMI 35-40 with co-morbidities. Surgery is recommended for patients with in the age groups from 18 to 60 years.