What is the One Anastomosis Gastric Bypass?

The One-anastomosis gastric bypass (OAGB) is also known as the ‘single loop bypass’ and the mini-bypass. It is a minimally invasive procedure performed with a laparoscopic technique.

How is the OAGB performed?

There are basically two main steps to this operation:

  1. The surgeon creates a small tube-like stomach pouch which is detached from the rest of the stomach.
  2. This gastric pouch is then connected up to the intestine, bypassing up to 200cm of the total length of the small bowel.

This technique differs from the Roux-en-Y gastric bypass, which has an extra join between the small bowel.

How is the OAGB effective for weight loss?

The OAGB typically results in 30 to 40% weight loss or up to 80% excess weight loss over a period of about 18 months. The most rapid weight loss is usually in the first 6 months. This weight loss is achieved through both the restrictive effect of the small pouch and the metabolic effect of bypassing the small intestine.

Would weight loss surgery benefit you?

BMI is one of the leading ways of measuring obesity. Find out your BMI and discover if you’re a candidate for surgery.
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Tell us about any other health issues

If you do not meet the BMI or weight criteria, you still may be considered for surgery if your BMI is over 30 and you are suffering serious health problems related to obesity.

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BMI is not the only criteria

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What is your outlook on weightloss?

Readiness to begin your wieghtloss journey is important.

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If you choose we can share information about your health, medical history and lifestyle with our team who will determine whether you are a candidate for weightloss surgery.


YES, all patients require a referral in order to see Mr Abbas.

Fees are dependent upon whether the patient holds any concession cards, such as a Pension or Health Care Card.

Currently initial consultation fees range between $130 and $250, with a medicare rebate of $76.15.

Waiting times vary and are dependent on the nature of surgery required, the location at which the surgery is to be performed, and associated availability of theatre times and the individual circumstances of the patient eg: private/self-funded.

Yes. All fees associated with surgery will be discussed with the patient prior to any surgery.

Medicare rebates are available for all applicable billing items.

Private health funds will contribute to the cost of inpatient surgical services, depending on the level of your cover, and whether or not you hold any concession cards.