Key takeaways
- Bariatric surgery is generally considered for patients with severe obesity or obesity-related health conditions.
- Type 2 diabetes, sleep apnea, hypertension, fatty liver disease, and reflux symptoms may affect treatment decisions.
- Asian patients may be considered at lower BMI thresholds than Western populations in some clinical guidelines.
- Final eligibility requires specialist evaluation, laboratory testing, imaging, endoscopy, anesthesia review, and risk assessment.
- GLP-1 medication history should be shared because it may affect the treatment discussion and perioperative planning.
Who may be considered?
Bariatric and metabolic surgery may be considered when obesity is severe enough to affect health, daily function, or long-term disease risk. Common reasons for considering surgery include:
- Long-standing obesity despite diet, exercise, and medical treatment
- Type 2 diabetes or worsening blood glucose control
- Obstructive sleep apnea
- High blood pressure
- Fatty liver disease or metabolic dysfunction-associated steatotic liver disease
- Joint pain or mobility limitation related to weight
- Repeated weight regain after non-surgical treatment
- Difficulty maintaining weight loss after stopping medication
A patient does not need to have every condition listed above. The decision depends on the overall clinical picture.
BMI criteria: why the number is only the starting point
BMI is often used as an initial screening tool, but it is not a full medical decision. Bariatric surgery guidelines commonly consider surgery for patients with BMI above 35 kg/m². Surgery may also be considered at lower BMI levels when type 2 diabetes or other obesity-related conditions are present.
For Asian patients, metabolic risk may occur at lower BMI levels than in Western populations. This is why BMI should be interpreted together with waist circumference, diabetes status, fatty liver disease, sleep apnea, blood pressure, medication history, and previous treatment response.
You can estimate your BMI with the calculator below — but remember it is only a starting point, not a decision.
Examples of patients who may request preliminary review
These are illustrative examples only, not eligibility promises.
- Example 1. A patient with BMI 37 and sleep apnea who has tried repeated diet programmes but regained weight may be suitable for hospital review.
- Example 2. A patient with BMI 32 and type 2 diabetes may be considered for metabolic surgery review, depending on diabetes duration, current medications, HbA1c, insulin use, and surgical risk.
- Example 3. A patient with BMI 30 who is using GLP-1 medication but regains weight after stopping may need a broader treatment discussion, but surgery is not automatically appropriate.
- Example 4. A patient with severe reflux symptoms may need careful procedure selection because sleeve gastrectomy can worsen reflux in some patients.
When surgery may not be recommended immediately
Bariatric surgery may be delayed or not recommended if there are unresolved medical or psychosocial risks. Examples include:
- Uncontrolled heart, lung, liver, kidney, or endocrine disease
- Active substance misuse
- Unstable psychiatric condition
- Untreated eating disorder
- Inability to follow postoperative diet and supplements
- High anesthesia risk
- Pregnancy or near-term pregnancy planning
- Lack of safe follow-up after returning home
- Incomplete medical records
These issues do not always mean surgery is impossible. They mean the hospital may request further evaluation before making a decision.
What if I am taking GLP-1 medication?
Patients using semaglutide, liraglutide, tirzepatide, or another GLP-1-based medication should share this information before hospital review. The medical team may ask:
- Which medication are you using?
- What dose are you taking?
- How long have you used it?
- How much weight did you lose?
- Did you experience nausea, vomiting, reflux, gallbladder symptoms, or pancreatitis?
- Did you regain weight after stopping?
- Are you using medication for diabetes?
GLP-1 history is important because it helps doctors understand treatment response, weight regain risk, diabetes control, and perioperative planning. Learn more in our GLP-1 vs bariatric surgery guide.
Information needed for preliminary review
Before requesting review, prepare the following information if available:
- Height and current weight
- Highest adult weight
- Weight history over the past 5 years
- Previous weight-loss treatments
- Current medications
- Diabetes history and HbA1c
- Blood pressure history
- Sleep apnea diagnosis or CPAP use
- Fatty liver or liver enzyme results
- Endoscopy results, if available
- Previous abdominal surgery history
- Smoking and alcohol history
- Pregnancy plans, if relevant
- Recent blood test results
- Any known heart, lung, kidney, liver, or thyroid disease
The more complete the information, the more useful the preliminary review can be.
What happens after preliminary review?
A preliminary review does not replace an in-person medical consultation. It helps determine whether it is reasonable to continue planning. A typical process may include:
- Patient submits basic medical information.
- NextWeight organizes the information for review.
- A Korean hospital or specialist team gives preliminary feedback.
- The patient receives a general care pathway or request for more information.
- If appropriate, travel planning and in-person consultation are discussed.
- Final eligibility is decided only after hospital evaluation in Korea.
Why consider Korea?
Korea may be suitable for patients who prefer a hospital-based approach, advanced laparoscopic surgical expertise, structured preoperative testing, and coordinated postoperative planning. Korea is not a low-cost mass-market surgery destination. It may be more appropriate for patients who prioritize safety, hospital quality, and careful review over speed or price alone. Read more about safety and evidence in Korea.