Mini Gastric Bypass (OAGB)
Mini gastric bypass — also called one-anastomosis gastric bypass (OAGB) — is a laparoscopic bariatric and metabolic procedure with a single intestinal connection. It offers strong weight loss and metabolic effects with a technically simpler setup.
Indications
Considered for adults with a BMI ≥ 40 or ≥ 35 with obesity-related conditions, and often for patients with type 2 diabetes. Final candidacy follows a full medical assessment.
Technique
A long, narrow gastric pouch is created and connected to a loop of small bowel approximately 150–200 cm distal to the duodenojejunal flexure, with a single anastomosis.
Recovery
Hospital stay is typically 3–4 nights. A staged liquid → soft → solid diet is followed during 4–6 weeks. Lifelong follow-up is essential.
Risks
Possible risks include bleeding, anastomotic leak, bile reflux, marginal ulcer, nutritional deficiencies and venous thromboembolism. Risks are reviewed individually.
Frequently asked questions
What is the difference from classic Roux-en-Y bypass?
Mini gastric bypass (one-anastomosis gastric bypass, OAGB) uses a single anastomosis between a long gastric pouch and a loop of small intestine. It is technically simpler and shorter, with comparable weight loss but a different reflux profile.
Is it suitable for type 2 diabetes?
OAGB has strong metabolic effects and is often considered for patients with type 2 diabetes; individual suitability is determined after evaluation.
Long-term follow-up?
Lifelong vitamin and mineral supplementation, periodic laboratory monitoring and endoscopic surveillance when indicated.
Last updated: 31.05.2026 · Medical content: Op.Dr.Gökhan ATEŞ