Following are the conditions in which Sleeve Gastrectomy is recommended,
BMI more than or equal to 40kg/m2. This means the person is obese. This is high when compared to other bariatric surgeries such as gastric plication in which 30 kg/m2 BMI is considered.
If all other conservative treatments such as medications, physical therapy, diet plan, or exercises don't work then this surgery may be considered.
If you are willing to make the permanent lifestyle changes and committed to losing weight then you may undergo this surgery.
If your BMI is between 35 to 39.9  with critical health issues such as high blood pressure, severe sleep apnea, and type 2 diabetes.
Also, it is advisable to check with your regional health insurance provider about the coverage of the surgery.