Anaesthesia in Thailand: The Pre-Operative Assessment and What to Ask

Anaesthesia in an accredited Thai hospital is planned and supervised by a physician anaesthesiologist, preceded by a pre-operative assessment that runs one to two days before the operation, and it carries a risk profile in healthy adults that is close to the one you would face in a good hospital anywhere: death caused directly by anaesthesia is around 1 in 100,000. The part that changes when you travel is not the drugs or the monitoring. It is that nobody has checked any of this on your behalf, so the questions about who gives the anaesthetic, what gets tested and what happens if a test finds something all land on you.

Almost every enquiry I get is about the surgeon. Almost none is about the person who keeps you alive while the surgeon works. That imbalance is understandable, since the surgeon is the one on the website, but it is the wrong way round for a lot of the risk. This guide is the anaesthetic half of the conversation, written from the patient’s side and checked by a doctor.

Who actually gives the anaesthetic

The direct answer is that in the large international-facing hospitals the anaesthetic is normally planned by a physician anaesthesiologist, and the person physically at your head for the whole procedure may be that doctor or may be a nurse anaesthetist working under their supervision. Thailand trains its specialist anaesthesiologists through a national college, and it also relies heavily on nurse anaesthetists, who are registered nurses with additional anaesthesia training and who deliver a large share of routine anaesthesia across the country¹.

Neither model is a red flag on its own. Plenty of countries, the United States among them, use nurse anaesthetists extensively with good results. What matters is that you know the arrangement before you pay. Ask three things in writing: who plans the anaesthetic and reviews your history, who is in the room throughout, and whether a physician anaesthesiologist is dedicated to your theatre or covering several. A hospital that answers precisely has told you it takes the question seriously. A hospital that says “our team” and moves on belongs in the pattern described in red flags and how to avoid them.

Accreditation helps here more than people expect. JCI’s hospital standards include a specific chapter on anaesthesia and surgical care, covering pre-anaesthesia assessment, monitoring during the procedure and recovery, and the qualifications of whoever administers sedation and anaesthesia². Confirming the accreditation is current, which is covered in choosing a hospital and JCI accreditation, is therefore also a check on the anaesthetic system, not just on the building.

What the pre-operative assessment is for

The pre-operative assessment exists to find the things about you that change the anaesthetic plan, and it is the single most protective step in the whole trip. Serious anaesthetic complications in healthy adults are rare; the risks that actually cause trouble come from the patient’s own conditions, uncontrolled blood pressure, poorly managed diabetes, undiagnosed sleep apnoea, a heart rhythm nobody knew about, medicines that interact with the anaesthetic³. The assessment is the hospital’s chance to find those before the day, and your chance to say the things you forgot to put on the form.

Anaesthetists summarise all of that with the ASA physical status classification, a six-point scale from ASA 1 (a healthy person) through ASA 2 (mild, well-controlled disease) and ASA 3 (severe systemic disease) upwards. Your ASA grade and the size of the operation together decide which tests you need. NICE’s guideline on routine pre-operative tests takes exactly that approach: a fit adult having minor surgery may need no routine tests at all, while an ASA 3 patient having major surgery is expected to have a full blood count, kidney function, an ECG and sometimes more⁴. Thai hospitals do not follow NICE, but the good ones follow the same logic, and if the test list you are sent looks either enormous or non-existent for what you are having, that is worth a question.

I sat in on this once, translating the practical bits for a friend having a hernia repair in Bangkok. The assessment took about forty minutes. The anaesthetist went through his medicines twice, asked about a reaction to an anaesthetic he had mentioned in passing in an email months earlier, and picked up that his blood pressure at rest was higher than his home readings. The surgery went ahead the next day as planned, but the anaesthetic plan changed slightly because of what that conversation found. None of it would have happened if he had landed the night before and gone straight to theatre.

What happens on the assessment day

Expect the assessment to take place after you land, usually one to two days before the operation, and expect it to be a fuller day than the itinerary suggests. A typical sequence at an international patient department is registration, blood tests, an ECG for anyone over about 45 or with a heart or lung history, a chest X-ray where indicated, then the surgeon’s final consultation, then the anaesthetist’s consultation, then the consent forms and the deposit. Bloods are usually back the same day; anything abnormal is reviewed before you are cleared for the list.

The anaesthetist’s consultation is where you are asked about previous anaesthetics and how you reacted, reflux, snoring or sleep apnoea, loose teeth or dental work, smoking and alcohol, allergies, and every medicine and supplement you take. It is also where the type of anaesthetic is settled: a general anaesthetic, a spinal or regional block, or sedation, depending on the operation and on you⁵. Ask what is planned and why. For a knee replacement, for example, a spinal with sedation is common and changes what the early recovery feels like.

You will be given fasting instructions. The standard adult pattern in current guidance is no food for about six hours before the anaesthetic and clear fluids permitted until about two hours before, though individual hospitals sometimes ask for longer, and the instruction you are handed is the one that applies³. People do lose surgery slots over a hotel breakfast. This is a large part of why the site suggests arriving early, set out in planning your surgery trip: the assessment day is not something to attempt on four hours of sleep.

The risks, in numbers

Modern anaesthesia is safe by any reasonable standard, and the useful thing is to know the actual figures rather than a reassuring adjective. From the Royal College of Anaesthetists’ patient information, which draws on large national audits³:

• Death caused directly by anaesthesia: around 1 in 100,000 general anaesthetics.
• Accidental awareness during a general anaesthetic: around 1 in 20,000.
• Serious allergic reaction (anaphylaxis) to an anaesthetic drug: around 1 in 10,000.
• Damage to teeth needing treatment: around 1 in 4,500.
• Nausea and vomiting afterwards: common, roughly 1 in 4 patients.
• Sore throat after a breathing tube: common, up to about 1 in 5.

Two things follow from those figures. The first is that the rare serious events are exactly the ones a thorough assessment and a physician-supervised anaesthetic are designed to catch or manage, which is why the “who” question matters more than the price. The second is that the common minor ones, nausea, a sore throat, a day of feeling foggy, are worth planning for in the hotel booking rather than being surprised by. Anti-sickness medicine is routinely given during the anaesthetic; if you have had bad nausea before, say so at the assessment.

Thailand does not publish comparable national audit figures in a form I can cite, which is itself worth knowing. The fair summary is that the accredited hospitals run on international standards and their anaesthetic departments are staffed by specialists, but the country-level data you can check at home does not exist in the same shape here. That pushes more weight onto the hospital-level checks in vetting a surgeon from abroad, where the same method (registration, specialist certification, volume) applies to the anaesthetist.

The surgical safety checklist and what to expect in theatre

Before the anaesthetic starts, an accredited hospital runs the WHO Surgical Safety Checklist or a local version of it: a 19-item, three-phase check (sign in before anaesthesia, time out before the first incision, sign out before you leave theatre) that confirms your identity, the operation, the site, allergies, airway concerns and blood loss risk with the whole team present¹. WHO introduced it in 2008 and it has been adopted in well over 100 countries. You will not see most of it, but you will experience the sign-in: being asked your name, date of birth and what you are having done, again, by people who already know. That repetition is the system working.

Afterwards you go to a recovery area with dedicated monitoring until you are awake and stable, then to the ward. Ask at the assessment how long the hospital expects you to be in recovery and whether a companion can join you on the ward, because the first hours after a general anaesthetic are when having someone to fetch water and read the discharge sheet is most useful.

What to send before you fly, and what to ask

The most useful thing you can do happens before any money moves: send a complete medical history and medicine list, including supplements and anything bought over the counter, and ask for the anaesthetic department’s view on anything relevant. Blood thinners, diabetes medicines, some blood pressure drugs and some weight-loss injections have specific pre-operative handling, and the hospital needs to plan that, not discover it. If you have had a difficult airway, malignant hyperthermia in the family, or a previous anaesthetic that went badly, ask for that to be reviewed by a physician anaesthesiologist before you book flights.

Then ask, in writing:

• Who plans the anaesthetic, who is in theatre throughout, and whether a physician anaesthesiologist is dedicated to the room.
• What type of anaesthetic is proposed and why.
• Which tests will be done, on which day, and whether the price includes them.
• What happens to the surgery date if a test is abnormal, and what that costs.
• Whether the anaesthetist’s fee is a separate line in the quote (it often is).

The NHS position on treatment abroad is that arranging it, including checking who provides each part of your care, is your own responsibility⁶. That is not a warning off. It is a description of where the work sits.

Anaesthesia and the flight home

The anaesthetic itself is largely out of your system within a day or two, but it is one strand of why the flight home is a clinical decision. Surgery, an anaesthetic and a period of reduced mobility all raise the risk of blood clots, and a long-haul flight adds hours of sitting still on top⁵. That is covered properly in when is it safe to fly after surgery; the relevant point here is that the anaesthetist’s notes, which type of anaesthetic, any airway difficulty, any reaction, belong in the paperwork you carry home, because a clinician at home who ever anaesthetises you again will want them.

The people I have watched do this well treated the anaesthetist as a second surgeon to vet, arrived early enough to be properly assessed, and were unbothered when a test moved a date by a day, because they had left room for it. The ones who had a bad week had usually landed the night before, filled in the history form on the taxi ride, and discovered at the bedside that something they had not mentioned mattered.

This guide is general information, not medical advice, and not a recommendation about any hospital, anaesthetist or technique. Whether you are fit for an anaesthetic, and which one, is a decision for the anaesthetist who assesses you and the clinicians who know your history at home.