Bariatric surgery6 min read
Tests and check-ups before bariatric surgery: what is needed and why
Before bariatric surgery every patient goes through a detailed check-up. It is not a formality: the results show whether surgery is safe now, which operation suits you and what should be treated first. This article lists the standard tests, explains why gastroscopy and heart checks matter, which extra tests may be added and which findings can postpone the operation, and how international patients can prepare them at home.
The main points in 30 seconds
- The check-up confirms safety, helps choose the operation and finds problems to treat first.
- Standard set: blood and urine tests, ECG, chest X-ray, ultrasound and leg vein Doppler.
- Gastroscopy is required; it can reveal ulcers, reflux, a hernia or infection.
- Uncontrolled diabetes, anaemia or an active ulcer can postpone surgery.
- Most tests can be done at home and sent in advance before the trip.
Key facts about the procedure
- Back to work2–4 weeks
- Stay in clinic1–5 days
- Final result18–24 months
- Price
$4,800from $3,600
Why thorough testing comes before bariatric surgery
Severe obesity often goes hand in hand with conditions that people do not know about: silent diabetes, sleep apnoea, fatty liver, anaemia or changes in the stomach lining. Each of them can raise the risk of anaesthesia and surgery if it is missed.
The check-up has three goals:
- to confirm that the operation and anaesthesia are safe for you right now;
- to help the surgeon choose between the sleeve, a bypass or another method;
- to find problems that are better treated before surgery, not after it.
The exact list depends on your age, weight, history and current treatment. The surgeon may add tests or skip some if recent results are already available.
Standard blood and urine tests
Laboratory tests are the base of the check-up. They are quick, but they tell the team a great deal about your metabolism, blood and organ function. The usual set includes:
- Complete blood count: shows anaemia, infection and platelet levels.
- Biochemistry: liver and kidney function, electrolytes, protein, cholesterol and other blood fats.
- HbA1c and blood glucose: average blood sugar over the past months, which reveals diabetes or prediabetes.
- Coagulation panel: how well the blood clots, important for bleeding risk.
- Urinalysis: kidney health and signs of infection.
- Blood group and infection screening: as required by the hospital before any operation.
Many clinics also check iron, vitamin B12, folate and vitamin D before surgery. A deficiency found now is easier to correct and gives a baseline for later follow-up.
Gastroscopy, ultrasound and imaging
Gastroscopy (upper endoscopy) is required before bariatric surgery. A thin camera looks at the oesophagus, stomach and first part of the intestine. It can show:
- inflammation, erosions or ulcers;
- a hiatal hernia and signs of reflux;
- Helicobacter pylori infection (with a biopsy or separate test);
- polyps or other changes that need attention.
These findings can influence the choice of operation: for example, significant reflux often speaks in favour of a bypass rather than a sleeve. Colonoscopy is added only when there are indications.
Imaging usually includes an ultrasound of the abdomen and kidneys, which shows fatty liver and gallstones, and a Doppler scan of the leg veins to rule out existing clots. A chest X-ray is part of the standard set before general anaesthesia.
Heart and lung checks
Extra weight puts steady strain on the heart and lungs, so both are checked before anaesthesia:
- ECG: rhythm disorders and signs of strain or old damage to the heart.
- Cardiologist opinion: especially with high blood pressure, chest pain, shortness of breath or known heart disease.
- Echocardiography or a stress test: added if the cardiologist sees a reason.
- Sleep apnoea screening: snoring, pauses in breathing and daytime sleepiness are signs that a sleep study may be needed.
Untreated sleep apnoea increases breathing problems after anaesthesia. When it is found, treatment is usually started before surgery and continued in hospital.
Blood and urine
- Main tests
- Blood count, biochemistry, HbA1c, clotting, urinalysis
- What they show
- Anaemia, diabetes, liver and kidney function, bleeding risk
Stomach
- Main tests
- Gastroscopy
- What they show
- Ulcers, hernia, reflux, infection
Abdomen and veins
- Main tests
- Ultrasound, leg vein Doppler
- What they show
- Fatty liver, gallstones, clots
Heart and lungs
- Main tests
- ECG, chest X-ray
- What they show
- Rhythm, strain, lung condition
Specialists
- Main tests
- GP, endocrinologist, cardiologist, psychiatrist, gynaecologist for women
- What they show
- Overall readiness for surgery
Extra tests for diabetes, thyroid or heart disease
If you already live with a chronic condition, the check-up goes deeper so that the condition is stable on the day of surgery:
- Type 2 diabetes: an endocrinologist reviews blood sugar control and your current treatment, which is often adjusted before and after surgery.
- Thyroid: thyroid hormone tests, as an underactive thyroid can contribute to weight gain and affects anaesthesia.
- Hormonal causes: in selected cases, tests for rarer causes of obesity, such as cortisol excess.
- Heart disease: additional heart imaging and a plan for any blood-thinning treatment around the operation.
All patients also meet a psychiatrist or psychologist. This is not a test you can fail; it helps to spot eating disorders or depression that need support and to prepare for life after surgery. Women see a gynaecologist, and pregnancy is ruled out.
What findings can delay surgery
Most results only confirm that you are ready. Sometimes, though, the surgeon asks to treat something first. Common reasons for a delay are:
- very high blood sugar or blood pressure that needs better control;
- anaemia or low protein, which slow healing;
- an active stomach ulcer or Helicobacter pylori infection;
- untreated sleep apnoea or heart problems found during the check-up;
- a clotting disorder or a fresh vein thrombosis;
- an acute infection or a flare-up of a chronic disease;
- pregnancy.
A hiatal hernia does not usually stop the operation: small and medium hernias are commonly repaired during the same surgery. A large hernia or severe reflux may change the choice of method. A delay is not a refusal; in most cases surgery goes ahead once the problem is under control.
Testing abroad and at City Medical Centre
City Medical Centre works with international patients, and much of the check-up can be done in your home country. Before travelling, you receive the list of tests; results can be sent in advance, which often shortens the stay. Laboratory results are usually expected to be recent, often from the last few weeks, while some imaging and specialist opinions can be older; the coordinator tells you the exact time limits for each test. Gastroscopy and any missing tests can be done at the clinic.
The first consultation is free and can be held online: the surgeon reviews your results, says which operation fits your case and names the cost, which is fixed in the contract. A personal coordinator stays with you from the first message to the end of recovery, and documents can be sent by Telegram. Details of the operations are on the bariatric surgery page.
How recovery usually goes
- First hoursYou may sit up, stand and drink fluids
- 1–5 daysObservation at the clinic, depending on the extent of surgery
- 2–4 weeksReturn to office work; physical work after about 1.5 months
- 1–2 monthsStaged diet from liquids to solids to let the stomach adapt
- Every monthOn average 10% of excess weight lost per month
- 1.5–2 yearsFinal result, stable eating habits prevent the weight from returning
Sources
Frequently asked questions
What tests are needed before bariatric surgery?
Usually a complete blood count, biochemistry, HbA1c, a clotting test and urinalysis, plus ECG, chest X-ray, abdominal and kidney ultrasound, a leg vein Doppler scan and gastroscopy. A GP, endocrinologist, cardiologist, psychiatrist and, for women, a gynaecologist give their opinions. Extra tests are added depending on your health.
Is gastroscopy required before bariatric surgery?
Yes. Gastroscopy checks the oesophagus and stomach for ulcers, inflammation, a hiatal hernia, reflux and Helicobacter pylori infection. These findings can change the choice of operation or show that something should be treated first, so it is part of the standard check-up.
How long are pre-op tests valid?
It depends on the test. Blood and urine results are usually expected to be recent, often from the last few weeks, while ECG, imaging and specialist opinions may be accepted for longer. The clinic coordinator gives you the exact time limits before you start collecting results.
Can I do the tests in my home country?
In most cases, yes. You receive a list of tests, do them locally and send the results in advance for the surgeon to review. Anything missing, including gastroscopy if needed, can be done at the clinic on arrival, which helps to plan a shorter stay.
Can a hiatal hernia stop the operation?
Usually not. Small and medium hiatal hernias are commonly repaired during the same operation. A large hernia or severe reflux may lead the surgeon to recommend a bypass rather than a sleeve. The decision is made after gastroscopy and examination.
Have a question about your case? Get a free consultation
Message a coordinator on Telegram: we reply right in the chat, and you can send photos and questions there too.
- The first consultation is free, online consultations are available
- The doctor names the cost after the assessment, and it is fixed in the contract
- A personal coordinator guides you from the first message to recovery
Message our coordinator on Telegram
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