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Gastric By-Pass

Length of Stay in Hospital
3 Days
Length of Stay in the City
7-10 Days
Recovery Duration
2 Weeks
Operation Duration
1-2 Hours
Type of Anesthesia
General Anesthesia

It is an operation applied to reduce the absorption of carbohydrate and fatty foods from the intestines. A large part of the stomach is bypassed and a small volume (approximately 30-50 cc) stomach section is formed and sutured to the small intestines in gastric bypass surgeries. As in other bariatric surgery operations, it is aimed to reduce the stomach volume and to disable a part of the intestines and to throw away some of the consumed food before absorption. Thus, patients are both satiated with less food and not all of the food they take is absorbed.

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How is Bariatric Surgeries Performed with Laparoscopic Method?

The entire procedure is performed by laparoscopic (close) surgery method. Laparoscopic surgery is performed by making many small incisions. Ports placed through these incisions are used for hand tools to reach the abdomen. One is a surgical telescope connected to a video camera and the others are for the entry of specialized surgical instruments. The surgeon watches the operation on a video monitor. An experienced laparoscopic surgeon can perform many procedures laparoscopically, just as in an open surgery.

How Is Gastric Bypass Surgery Performed and How Does It Work?

Gastric bypass limits both food intake and food absorption. Almost 95% of the stomach, duodenum and the first 1meter of the upper part of small intestine are medically bypassed. Gastric bypass reduces stomach size by over 90%. The stomach may enlarge up to 1000 ml, sometimes. Gastric bypass pouch is 15-30 ml in size. The gastric bypass pouch is formed in the upper part of the stomach that can be stretched the least. Therefore, there won’t be any significant increase in volume of the pouch in the long run.

When a small amount of food is ingested, the first response is the stretching of stomach’s wall and nerves stimulate the brain that the stomach is full. Patients feel full after a small portion of food has been consumed as if they have been eaten a large meal. Many people do not stop eating when they feel full. However, patients learn very quickly that they must eat their next bite very slowly and carefully to avoid increased discomfort or vomiting. Patients eat less and consumed food goes directly to the end of intestine from the stomach, so they lose weight quickly in this way.

One of the biggest advantages of this operation is that the taken food and the fluids (enzymes, gall and pancreatic fluids) produced by remaining gastric (non-food) converge at a later point, rather than immediately. Thus, the absorption of fat and sugar, that is the absorption of calories, are reduced (absorption reducing effect).

In addition, patients feel full longer with slow emptying time of the stomach since the transition point of the reduced stomach to the intestine is smaller than before.

Gastric Bypass Advantages

  • Reversion is possible since any part of the stomach is not destroyed.

  • Eating and drinking comfort and portion size are better than the sleeve gastrectomy operation.

  • It also treats reflux in patients with reflux or gastric hernia.

  • It creates a more permanent solution to Type 2 Diabetes and other related diseases.

  • It is less likely to gain weight compared to sleeve gastrectomy operation.

  • There is no liquid feeding period after the operation.

Disadvantages of Gastric Bypass

  • It is technically a more difficult operation for the surgeon.

  • Gastric ulcer is more common, especially in patients who smoke.

  • It is more likely to have dumping syndrome.

What are the Disadvantages of Gastric Bypass Compared to Gastric Sleeve?

  • Longer-term vitamin and mineral deficiencies (especially vitamin B12, iron, calcium and phosphate deficiencies) may result.

  • Dietary recommendations, lifelong vitamin-mineral supplementation and post operation follow-up are required.

  • Options are limited if patients regain weight.

  • Endoscopic intervention is not an option for bile-pancreatic duct when there is a problem. ERCP and biopsy cannot be performed.

  • There is no chance to control closed stomach tissue with endoscopy.

  • Since the fundus part of stomach that secretes Gharlin (appetite hormone) is not removed, appetite reduction is less compared to gastric sleeve.

Which Tests Are Performed Before Gastric Bypass Surgery?

The following tests and examinations are applied to every patient before the surgery;

  • Blood biochemistry tests,

  • Hemogram,

  • Hormone tests,

  • Hepatitis tests,

  • Whole abdominal ultrasound,

  • Gastric endoscopy (with anesthesiologist),

  • ECG (ElectrocardioGraphy-heart graphy),

  • Lung X-ray,

  • Lung breathing test,

  • If needed, effort test and ECO (EchocardioGraphy)


After all these tests, necessary examinations are carried out by Anaesthesiology, Internal Medicine, Cardiology, Chest Diseases and Endocrine specialists. As a result of these examinations, first of all, it is checked whether there is another underlying disease that may cause the patient to gain weight. If there is no such disease, the patient is examined in terms of anaesthesia, like every patient who will undergo surgery, and it is checked whether there is an obstacle to the surgery. Relevant specialists make recommendations about the treatments to be applied before the surgery, if necessary. In this way, issues that may occur during and after the surgery are minimized.

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Walk-through: What's next?

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First Contact

From the very first contact, we will explore your situation in-depth and start planning the path to the beauty.


Doctor Choice

We will connect you with the best doctors in their fields for your special needs.



We will assist you to plan your trip and give you advises on city tours.


Transport and Transfer

Based on your operation schedule, you will fly to Istanbul on the most convenient date for you. From then on, your transfers and appointments will be arranged by us.


Operation Day

You will be in right hands to reveal your beauty on the date of the operation.



When your procedures are done, you will return home to enjoy your new life.

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