NZ-specific risk guide
Covers gastric sleeve, gastric bypass (Roux-en-Y and mini), gastric band and other bariatric procedures performed in New Zealand.
Last reviewed: 2026-05-27 · how we source risk data
Performed by general surgeons (FRACS) with sub-specialty bariatric training. Verify MCNZ registration in general surgery scope + procedure-specific experience.
Risks are categorised by frequency reported in NZ + Australasian surgical college guidance. None of this is a substitute for an individual clinical assessment by a registered practitioner.
What: Especially with sleeve. Most resolves over weeks-months. Sleeve patients with significant reflux may need conversion to bypass.
How risk is reduced: Choose procedure type based on baseline reflux; follow dietary progression strictly.
What: Iron, B12, calcium, vitamin D, protein. Universal after bypass; common after sleeve.
How risk is reduced: Lifelong supplementation + annual blood tests.
What: Rapid weight loss increases gallstone risk. Some surgeons offer prophylactic gallbladder removal.
How risk is reduced: Discuss with surgeon pre-op.
What: Sweating, palpitations, diarrhoea after eating sugar/refined carbs. Usually managed by diet.
How risk is reduced: Dietitian-supervised eating pattern.
What: Surgical-site infection requiring antibiotics.
How risk is reduced: Standard post-op wound care.
What: Serious complication, usually within first 30 days. May require return to theatre.
How risk is reduced: Choose a high-volume bariatric surgeon; recognise warning signs.
What: Can occur months-to-years post-bypass. Causes intermittent abdominal pain.
How risk is reduced: Surgeon technique reduces but doesn't eliminate. Seek review for unexplained abdominal pain post-op.
What: Some sleeves convert to bypass for reflux; bands have higher long-term revision/removal rates than sleeve or bypass.
How risk is reduced: Choose procedure carefully; band is falling out of favour internationally.
What: Bariatric patients have higher baseline DVT risk.
How risk is reduced: Compression, early mobilisation, prophylactic anticoagulation per surgeon's protocol.
What: NZ + Australian published 30-day mortality is well under 1% in high-volume centres.
How risk is reduced: Choose a high-volume bariatric surgeon at an accredited facility.
Severe abdominal pain, shortness of breath, chest pain, fever, vomiting blood, persistent vomiting — call 111 or go to ED.
This page draws on NZ + Australasian surgical college guidance and NZ regulator publications. Full list:
This page is general guidance about the kinds of risks documented for weight loss (bariatric) surgery in New Zealand and Australia. It is not a substitute for an in-person clinical assessment. Risk profiles depend on the specific procedure, your individual health, the surgeon\'s experience and the facility. Always discuss your specific situation with a registered practitioner before consenting to any procedure.
Laser vision correction for myopia, hyperopia and astigmatism.
Augmentation, reduction, lift and reconstruction.
Facelift, rhinoplasty, liposuction and body contouring.
General dentistry, braces and aligners.
Single, multiple and all-on-4 implant options.
Gastric sleeve, bypass and band procedures.