Am I Eligible for Gastric Sleeve Surgery? BMI & Criteria

Eligibility Overview

Who May Be a Candidate for Gastric Sleeve Surgery?

Gastric sleeve surgery is not a cosmetic procedure — it is a clinically recognised treatment for obesity and its associated health conditions. In Australia, eligibility is determined by a combination of factors including your Body Mass Index (BMI), medical history, previous weight loss attempts, and psychological readiness.

Dr Oliver Florica conducts a thorough assessment of every patient to determine whether gastric sleeve surgery is an appropriate and safe option. The following criteria provide a general guide, but individual assessment is always required.

BMI Criteria

Body Mass Index (BMI) Requirements

BMI is the primary screening tool used to assess eligibility for bariatric surgery. The following categories are generally used:

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BMI ≥ 40

Primary Eligibility

Patients with a BMI of 40 or above (classified as severe or morbid obesity) are generally considered eligible for gastric sleeve surgery, even without additional obesity-related health conditions.

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BMI 35–39.9

With Comorbidities

Patients with a BMI between 35 and 39.9 who have one or more significant obesity-related health conditions may be eligible. These conditions include type 2 diabetes, obstructive sleep apnoea, hypertension, and severe joint disease.

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BMI 30–34.9

Select Cases

In some cases, patients with a BMI of 30–34.9 who have poorly controlled type 2 diabetes or metabolic syndrome may be considered for surgery. This is assessed on a case-by-case basis.

BMI is calculated as weight (kg) divided by height (m) squared. For example, a person who is 170cm tall and weighs 120kg has a BMI of approximately 41.5. Your GP or our team can calculate your BMI during your referral or consultation.

Health Conditions

Obesity-Related Conditions That May Support Eligibility

Having one or more of the following conditions in combination with an elevated BMI may strengthen your candidacy for surgery:

✓ Type 2 diabetes mellitus
✓ Obstructive sleep apnoea
✓ High blood pressure (hypertension)
✓ High cholesterol (dyslipidaemia)
✓ Non-alcoholic fatty liver disease (NAFLD)
✓ Gastro-oesophageal reflux disease (GORD)
✓ Severe osteoarthritis of weight-bearing joints
✓ Polycystic ovary syndrome (PCOS)
✓ Urinary stress incontinence
✓ Significant psychological impact of obesity

Additional Factors

Other Assessment Criteria

Beyond BMI and health conditions, several other factors are considered:

✓ Previous weight loss attempts: You should have made genuine attempts to lose weight through diet, exercise, and/or medical management. Surgery is typically considered when these approaches have not achieved sustained results.
✓ Age: Gastric sleeve surgery is generally performed on adults aged 18–65. Patients outside this range may be considered on a case-by-case basis.
✓ Psychological readiness: A psychological assessment may be recommended to ensure you are emotionally prepared for the lifestyle changes required after surgery.
✓ No contraindications: Certain medical conditions may make surgery unsuitable or require additional management beforehand.
✓ Commitment to follow-up: Long-term success requires ongoing dietary changes, exercise, vitamin supplementation, and regular medical follow-up.

The Consultation

What to Expect at Your Consultation

Your initial consultation with Dr Florica is a comprehensive assessment designed to determine whether gastric sleeve surgery is right for you. Here is what you can expect:

Medical History Review

Dr Florica will review your full medical history, including previous weight loss attempts, current medications, and any existing health conditions.

Physical Assessment

A thorough physical examination including BMI measurement, blood pressure, and assessment of your overall health and fitness for surgery.

Discussion of Options

Dr Florica will explain the available surgical options (gastric sleeve vs gastric bypass), discuss the benefits and risks of each, and recommend the most appropriate approach for your situation.

Pre-operative Requirements

If surgery is recommended, the team will outline any additional assessments needed (blood tests, sleep study, dietitian review, psychological assessment) and provide a timeline for your surgical journey.

Learn more about what gastric sleeve surgery involves or understand the costs and Medicare rebates before your consultation.

Am I Eligible for Gastric Sleeve Surgery?