Here is the fastest way to assess an international bariatric programme. Send them your height, your weight, and ask for a price. If a firm quote for a specific operation comes back before anyone has asked what medications you take or looked inside your stomach, you have learned everything you need to know.
A bariatric workup isn't administrative friction. It is a screening programme that routinely finds things nobody knew were there, and each of those findings either changes the operation, changes the anaesthetic plan, or gets treated first. Skipping it doesn't save you six weeks. It moves the risk from before the surgery to during it.
The seven components, and what each is actually looking for
1. Upper endoscopy
A camera down the oesophagus into the stomach. This is the single highest-yield test in the whole workup and the one most often omitted by budget programmes, because it requires a gastroenterologist, a scope, and sedation.
What it finds: hiatal hernia (repaired during the same operation if present), erosive oesophagitis, Barrett's oesophagus (which rules out a sleeve), gastritis, ulcers, and Helicobacter pylori — a bacterial infection that is treated with antibiotics before surgery, because operating on an infected stomach raises the risk of leak and ulceration at the staple line.
2. Full laboratory panel
Not just a pre-op clotting screen. A bariatric panel establishes your baseline in the nutrients you will spend the rest of your life monitoring: vitamin D, B12, folate, iron studies and ferritin, calcium, parathyroid hormone, thiamine, zinc, copper. Deficiency before surgery is common and needs correcting first, because surgery makes every one of those numbers harder to hold. Add liver function, HbA1c, lipids, kidney function, and a full blood count.
Get your baseline labs at home
This is the piece of the workup most worth doing before you travel, and it's usually the cheapest. A baseline panel drawn by your own doctor, in your own health record, is the reference point every future lab gets compared against — and it stays in a system your home clinicians can actually see. Ask for a copy in PDF, not just a portal login.
3. Sleep study
Obstructive sleep apnoea is extremely common in patients presenting for bariatric surgery and frequently undiagnosed. It matters enormously to the anaesthetist: it changes airway planning, post-operative monitoring, and pain management, because opioids and untreated apnoea are a dangerous combination. Patients who need CPAP are generally asked to be established on it before surgery, not after.
4. Cardiac and pulmonary assessment
An ECG at minimum; echocardiogram, stress testing or pulmonary function testing depending on age, symptoms and comorbidity. The threshold is set by your history, not by a fixed protocol.
5. Psychological evaluation
The one patients resent most and the one that predicts the most. It isn't a test you pass or fail — it's an assessment of eating patterns, substance use, mood, expectations, and whether you have the support structure to manage a permanent change.
Two things it screens for that people rarely anticipate: alcohol — metabolism changes markedly after bypass and there's a well-documented increase in alcohol use disorder in the years following surgery — and expectations. A patient who believes surgery will fix a marriage, a career, or a depression is a patient who will be devastated at month eighteen regardless of how much weight they lose.
If disordered eating is part of your history
Say so. It doesn't automatically disqualify you, and hiding it is far more dangerous than disclosing it. Bariatric surgery imposes rigid, permanent constraints on eating, and a team that knows your history can build in the right monitoring and support. A team that doesn't know can't. If you're currently in treatment, your treating clinician should be part of this conversation before you book anything.
6. Dietitian assessment
Ideally more than one session. The purpose is not to hand you a diet sheet — it's to find out what you actually eat, what your constraints are, and whether the post-operative progression is survivable in your life. It's also where the lifelong supplementation regimen gets explained properly, which is the part patients most reliably underestimate. We cover it separately in the supplementation piece.
7. Pre-operative diet
Usually the final two weeks. Its purpose is specific and mechanical: shrinking the liver. In severe obesity the left lobe of the liver is enlarged and fatty, and it sits directly over the operative field. A smaller liver means better visualisation, less retraction, less bleeding, and a lower chance of the operation being converted or abandoned. Your programme prescribes and supervises it — this is not something to improvise from the internet.
What the workup finds
Ask any bariatric team and they'll tell you the same thing: the workup regularly changes the plan. A hiatal hernia that turns a sleeve into a sleeve-plus-repair. Barrett's that turns a sleeve into a bypass. H. pylori that delays everything by three weeks of antibiotics. Sleep apnoea that adds a night of monitored recovery. Anaemia that needs correcting first. Occasionally, something that means surgery is the wrong answer entirely, at least for now.
None of that is failure. That is the process working.
The shortcuts, ranked by how much they should worry you
| What they skip | How it's justified | Why it matters |
|---|---|---|
| Upper endoscopy | "Only if you have symptoms" | Disqualifying. Silent hiatal hernia and Barrett's are common and change the operation. |
| Psychological evaluation | "We don't gatekeep our patients" | Disqualifying. It's a standard of care, not gatekeeping. |
| Sleep study | "You'd know if you had it" | Serious. Undiagnosed apnoea is an anaesthetic risk, not a comfort issue. |
| Bariatric micronutrient panel | "We'll check after surgery" | Serious. Without a baseline you can't interpret anything later. |
| Dietitian sessions | "We'll give you a handout" | Serious. A handout doesn't survive contact with month four. |
| Pre-operative diet | "Not required with our technique" | Concerning. Makes the operation technically harder for no patient benefit. |
| Written revision pathway | Never comes up | Concerning. Roughly one patient in ten will eventually need one. |
How much of this can you do at home?
Most of it, and you should. Labs, sleep study, cardiac screening and the psychological evaluation can all be done in your own country, in your own health record, by clinicians you can go back to. That does three things: it shortens the trip, it keeps your home providers informed, and it gives you a second set of eyes on the findings.
What generally happens in Colombia is the endoscopy — often on arrival, a day or two before surgery — the anaesthetic assessment, and the final surgical consultation. A good programme will tell you exactly which items they'll accept from home and which they insist on repeating, and will say so in writing.
Send this to any programme you're considering
- What is your complete pre-operative checklist? Please send it as a document.
- Which items will you accept from my home providers, and how recent do they have to be?
- Who performs my endoscopy, where, and when relative to surgery?
- Who performs the psychological evaluation, and what are their credentials?
- If the workup finds something that changes the plan, what happens to my deposit and my dates?
- What is the pre-operative diet, and who supervises it?
The quality of the answer to question five tells you almost everything. A programme that has a clear, unembarrassed policy for "the workup changed the plan" is a programme where that actually happens.
The accreditation layer
Colombia's advantage here is structural: bariatric surgery is generally performed inside full hospitals with intensive care, interventional radiology and a blood bank on site, rather than in standalone surgical clinics. That matters most on the day nothing goes wrong — and it matters absolutely on the day something does. The country's accredited hospital network is covered in more depth at ColombiaMedical.co.
Next: what the package price leaves out.
Want to know what a Colombian team would require from you?
We'll send you the full pre-operative checklist that accredited Colombian bariatric programmes use — including what you can get done at home before you travel, which is most of it.
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