Skip to main content

Roux-en-Y gastric bypass - the metabolic operation.

Laparoscopic or robotic RYGB by a consultant bariatric surgeon with a full MDT - dietitian, psychologist and endocrinologist embedded from day one, and two years of follow-up as standard.

See indicative pricing
A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

Indicative pricing

What private RYGB costs in the UK.

Full-package ranges - MDT, surgery and two years of follow-up.

In short

Laparoscopic RYGB with two-year follow-up: £14,500–£19,000 all in.

ServiceIndicative range
Laparoscopic Roux-en-Y gastric bypass£12,500–£16,000
Robotic Roux-en-Y gastric bypass£15,000–£20,000
Revision surgery (sleeve to RYGB)£16,000–£24,000
Reversal of RYGB (rare)£18,000–£28,000
Bariatric MDT assessment package£950–£1,600
Two-year follow-up bundle (visits + bloods)£1,200–£1,800

Prices depend on hospital, consultant and whether a concurrent cholecystectomy or hiatus hernia repair is done. Revision surgery sits at the top of the range.

The problem

Bariatric surgery without follow-up is a broken operation.

Overseas packages and low-cost operators do the theatre bit well. What fails is the follow-up - the vitamins, the psychology, the internal-hernia call at year three. We build the whole thing.

  • MDT before the knife

    Dietitian, psychologist and endocrinologist sign off before you consent. No exceptions.

  • The honest procedure conversation

    Sometimes a sleeve is the right answer. Sometimes GLP-1 medication is. We say so.

  • Two years of follow-up, as standard

    Bloods and dietitian at 3, 6 and 12 months, and again at 24 months. Bariatric surgery is a lifelong plan, not a one-off.

When it helps

Who RYGB suits best.

Where bypass is the metabolic operation of choice - and where it is the wrong tool.

  • BMI 40+ or 35+ with comorbidities

    The standard NICE and NHS eligibility bar. Comorbidities that count include type 2 diabetes, hypertension, sleep apnoea and NAFLD.

  • Type 2 diabetes with obesity

    RYGB delivers strong metabolic effects independent of weight loss - remission or major improvement is common in the first year.

  • Severe reflux with a sleeve on the table

    Bypass beats sleeve for GORD - the pouch has no acid-producing fundus and the Roux limb diverts bile.

  • NAFLD or NASH

    Non-alcoholic fatty liver disease and steatohepatitis improve with RYGB - a growing indication in metabolic clinics.

  • Failed sleeve gastrectomy

    Weight regain or persistent reflux after a sleeve - conversion to RYGB is a common revision route.

  • Sweet-eater or high-volume eating pattern

    RYGB gives both restriction and dumping-mediated aversion to sugar and fat - helpful for a specific eating profile.

  • Obstructive sleep apnoea

    Weight loss after RYGB usually reduces or resolves CPAP dependence within a year, in well-monitored patients.

  • Red flag: active alcohol misuse or untreated eating disorder

    RYGB accelerates alcohol absorption and raises alcohol-use disorder risk. Active binge-eating disorder needs treatment first - surgery is not the answer.

Options

Bypass is one of several answers.

Every viable bariatric option, from sleeve and mini-bypass to endoscopic and medical routes.

  • Laparoscopic RYGB

    The workhorse - five ports, gastric pouch, Roux limb, biliopancreatic limb, two anastomoses. 90–180 minutes, one to two nights.

  • Robotic RYGB

    da Vinci or Versius platforms. Better dexterity for high-BMI patients and revision cases; longer theatre time and higher cost.

  • Mini gastric bypass (OAGB)

    One anastomosis, longer gastric tube. Simpler but with more bile reflux risk - covered on the mini-gastric-bypass page.

  • Sleeve gastrectomy

    Vertical resection of the greater curve, no anastomosis. Faster, lower risk, but weaker on reflux and diabetes than RYGB.

  • SADI-S (single anastomosis duodeno-ileal switch)

    A duodenal switch variant with strong weight loss and metabolic outcomes; niche in the UK for very high BMI.

  • Endoscopic sleeve gastroplasty

    Non-surgical option - sutures reshape the stomach through a gastroscope. Modest results compared to RYGB.

  • GLP-1 medical pathways

    Semaglutide and tirzepatide give 15–20 percent weight loss with lifelong medication. A serious non-surgical alternative for the right patient.

  • Revision surgery

    From sleeve to RYGB for reflux or regain; from RYGB to distal RYGB for regain; rarely, RYGB reversal for severe complications.

Safety and recovery

What to expect afterwards - honestly.

RYGB is safer than most people realise but demands lifelong self-care.

  • Anastomotic leak

    The dangerous early complication - 0.5–2 percent. On-table leak tests, methylene blue and enhanced-recovery monitoring catch most.

  • Bleeding and blood transfusion

    Post-op bleeding under 2 percent. TXA and staple-line reinforcement reduce risk further.

  • Marginal ulcer

    At the gastrojejunal join - 3–5 percent. Prevented by lifelong smoking cessation, NSAID avoidance and PPI for at least 6 months.

  • Internal hernia

    Lifetime risk 1–5 percent, higher after big weight loss. Mesenteric defects are always closed. Any post-op crampy abdominal pain deserves a CT.

  • Dumping syndrome

    Sweaty, dizzy, palpitations after sweet or high-carb foods. Early dumping in weeks, late dumping possible. Managed by portion and macro control.

  • Nutritional deficiency

    Iron, B12, folate, calcium, vitamin D, thiamine - all can drop. Lifelong bariatric multivitamin and annual bloods are non-negotiable.

  • Alcohol sensitivity and misuse risk

    Alcohol hits harder and faster after RYGB. Alcohol-use disorder risk is genuinely higher - worth discussing before consent.

  • Bone loss and gallstones

    Bone density falls in the first two years; DEXA at year two. Gallstones form in 20–30 percent - prophylactic ursodeoxycholic acid reduces the rate.

  • Red flags after surgery

    Persistent tachycardia, severe abdominal pain, vomiting, breathlessness or fever above 38.5: same-day bariatric team or A&E, not a GP call.

Reading your notes

Your operation note in four parts. Read the last one first.

Every bariatric operation note lists limb lengths - keep them for life, they matter if you ever need imaging or revision.

A UK consultant bariatric surgeon reviewing operation notes

A quiet reminder

Keep a bariatric passport.

Operation date, limb lengths, vitamins and last bloods - one page you can hand to any doctor in future.

  1. 01Header

    Operation and configuration

    RYGB or revision, laparoscopic or robotic, pouch volume, Roux limb and biliopancreatic limb lengths.

  2. 02Technique

    Anastomoses and defect closure

    How the gastrojejunostomy and jejunojejunostomy were formed, whether mesenteric defects were closed, and any leak test result.

  3. 03Findings

    Intra-abdominal findings

    Adhesions, liver appearance, hiatus hernia, gallbladder - and any concurrent hiatus repair or cholecystectomy.

  4. 04Impression

    Diet stages, meds and follow-up

    Read this first: diet stages, PPI duration, multivitamin regimen, and the 3, 6, 12-month follow-up plan.

Recognised by major UK insurers

BupaAXA HealthVitalityAvivaWPACignaHealixBupaAXA HealthVitalityAvivaWPACignaHealixBupaAXA HealthVitalityAvivaWPACignaHealix

RYGB is often covered by UK insurers when BMI and comorbidity criteria are met; some policies exclude bariatric surgery.

Frequently asked

Everything we get asked about RYGB.

Quick answers on weight loss, sleeve vs bypass, cost, cover and lifelong care.

  • What is a Roux-en-Y gastric bypass?

    A small (15–30 ml) gastric pouch is stapled off from the top of the stomach and joined directly to a Roux limb of small bowel, bypassing the rest of the stomach and the first metre or so of small intestine. Food takes a short, restricted route while bile and pancreatic juices flow down a separate biliopancreatic limb, meeting food further downstream. The result: restriction, altered gut hormones, calorie and nutrient malabsorption, and strong metabolic effects.

  • How much weight will I lose after RYGB?

    On average, patients lose 60–80 percent of their excess body weight in the first 12–18 months and maintain 50–65 percent excess weight loss long term. Individual results depend on adherence to the diet stages, physical activity and psychological support. Most weight is lost in the first year; the second year is about consolidation.

  • Is RYGB better than a sleeve gastrectomy?

    Not universally. RYGB tends to give better long-term weight loss, stronger control of type 2 diabetes and better resolution of severe reflux. Sleeve is technically simpler, has no intestinal anastomosis, and works well for lower BMI patients without reflux. Your comorbidities and eating pattern usually decide.

  • What does RYGB cost privately in the UK?

    Roughly £12,500–£16,000 for laparoscopic RYGB, £15,000–£20,000 for robotic RYGB, £16,000–£24,000 for revision from sleeve to bypass, plus £950–£1,600 for the pre-op MDT bundle and £1,200–£1,800 for the two-year follow-up bundle. Most UK insurers cover it after pre-authorisation if you meet BMI and comorbidity criteria.

  • What can I not eat again after RYGB?

    Nothing is universally forbidden, but sugary drinks, sweets, high-fat foods and large volumes will make you unwell. Carbonated drinks, alcohol and NSAIDs are discouraged for life. Chewing thoroughly, small portions and separating drinks from meals become second nature.

  • Will I need vitamins forever?

    Yes. A bariatric multivitamin, calcium and vitamin D daily, plus B12 by injection or high-dose oral every three months. Annual bloods check iron, folate, B12, calcium, vitamin D and thiamine. Skipping vitamins is the fastest route to serious problems years later.

Related treatments

Looking for something else?