How to Prepare for a Health Check-up in Bangkok: A Practical Checklist

A health check-up at a Bangkok hospital is efficient, but it is also a long morning of blood draws, scans and waiting rooms. Knowing how to prepare for a health check-up makes two things more likely: that the day runs smoothly, and that your results reflect your normal health rather than yesterday's workout, dinner or sauna session.

This checklist covers fasting, medicines, training, what to bring and how to get a report you can use at home. Hospital instructions differ by package, so treat it as a starting point and follow the specific sheet your hospital sends. For an overview of check-up types and how hospitals structure them, see our health check-up guide.

Fasting rules and water

Most packages include a fasting blood test for glucose and cholesterol, which means no food beforehand. Fasting periods in hospital instructions vary:

The practical approach: eat a normal, not unusually heavy, dinner the evening before, then stop eating at the time your hospital specifies. Book an early slot so you are not fasting through the late morning.

Water is usually allowed and helps make veins easier to find. Two exceptions are common: packages with endoscopy, colonoscopy or certain CT scans may restrict even water, and abdominal ultrasound often asks you to drink water and hold your urine so the bladder is full. Read your package instructions carefully on this point.

Avoid gum, mints and sweetened drinks while fasting. If you feel faint or unwell while fasting, tell the nurses rather than pushing through.

Medications and supplements to mention

Bring a list, or the packaging, of everything you take, including prescription medicines, over-the-counter painkillers, vitamins and supplements.

• Regular medicines. Many hospitals let you take blood pressure medicine with a small sip of water on the morning of the test, but ask your doctor or the hospital first. Do not stop any prescribed medicine on your own.
• Diabetes medicines and insulin. These need specific instructions because fasting can cause low blood sugar. Call the hospital or your doctor in advance and follow their advice.
• Blood thinners. Mention them, especially if your package includes endoscopy or any procedure.
• Biotin. High-dose biotin, common in hair, skin and nail supplements, can interfere with some laboratory tests. The US Food and Drug Administration has warned that it can cause falsely high or low results, including in some heart tests. Tell the staff if you take it.
• Creatine and protein supplements. Mention them, as they can be relevant when a doctor reads kidney or muscle markers.

If you are or may be pregnant, tell the nurses before any X-ray or CT.

Avoid training and sauna the day before

This is the step most active people skip, and it can change your results.

Hard exercise temporarily raises markers released from muscle. A 2008 study in the British Journal of Clinical Pharmacology found that a single hour of weightlifting in healthy men not used to it raised creatine kinase and the liver enzymes AST and ALT, which stayed elevated for at least a week. Those numbers can look like a liver or muscle problem on a report and lead to unnecessary follow-up tests.

Practical rules for the days before:

• Avoid unusually hard or new training for several days if you can, especially heavy lifting, long runs, Muay Thai sparring or a new class format.
• Keep the day before light: a walk or easy mobility work is fine.
• Skip the sauna and long hot sessions the day before. Heavy sweating can leave you dehydrated, which can make blood harder to draw and shift some results. If you have had dizziness after saunas, our guide to sauna dizziness and fatigue explains why.
• Avoid alcohol for at least 24 hours; one Bangkok hospital advises this in its preparation guide.
• Sleep normally. The same guide suggests at least six hours.

If you did train hard, tell the doctor reviewing your results. It helps them interpret a raised muscle or liver marker.

What to bring

• Passport (or Thai ID) for registration
• List or packaging of all medicines and supplements
• Previous results and reports, especially for any existing condition, plus earlier imaging such as mammograms
• Glasses or contact lens case if your package includes an eye test
• Comfortable, loose clothing with sleeves that roll up easily; hospitals usually provide a gown
• Exercise shoes if your package includes an exercise stress test
• A snack for after the fasting tests are done
• Insurance details, if relevant, though most check-ups are paid upfront

Leave jewellery at home where possible, as you may need to remove it for X-rays and mammograms. Women may be asked to schedule urine tests away from their period, and some hospitals suggest timing mammograms for about a week after a period ends.

Plan for a long visit. Most annual check-ups take two to six hours depending on the package and whether imaging is included. If you are planning a longer stay with extra tests, our guide to planning a longevity trip to Bangkok covers scheduling across several days.

Getting your report in English

Large private hospitals in Bangkok have international patient services and usually provide English-language reports, but confirm this when you book.

Questions to ask:

• Will I receive the full laboratory report, not just a summary?
• Will a doctor go through the results with me on the day, and in English?
• When will the remaining results arrive, and how: app, email or a second visit?
• Can I get imaging reports and, if needed, the images themselves on a digital file?
• Who do I contact if a result needs follow-up after I leave Thailand?

Some results, such as certain lab panels or specialist reports, may arrive days later. Keep digital copies of everything so you can share them with your doctor at home. If you are still comparing packages, see our guide to health check-up packages in Bangkok for inclusions and pricing.

Frequently asked questions

Can I drink coffee before a blood test?

Usually not during the fasting period. One Bangkok hospital's preparation guide asks patients to avoid caffeine for 8–12 hours before general exams, as it can affect blood pressure and heart rate. Black coffee may seem harmless, but follow your hospital's instructions and save it for after your tests.

Should I skip the gym?

For the day before, yes, and ideally avoid unusually hard sessions for several days beforehand. Heavy exercise can raise muscle and liver markers for up to a week in people unused to it. A walk or light stretching is fine.

Can I take my regular medicines on the morning of the check-up?

Often yes, with a small sip of water, but it depends on the medicine and your package. Diabetes medicines in particular need specific advice. Check with your doctor or the hospital before the day.

What if I have my period on the day?

Tell the nurses. Menstrual blood can affect urine tests, so they may suggest repeating that test later or rescheduling some parts of the package.

Related guides

• Health check-up packages in Bangkok: prices and inclusions
• Standard check-up or longevity biomarker panel?
• Reading your check-up report
• Planning a longevity trip to Bangkok
• Compare check-up providers

This guide is general information, not medical advice. Prices and services change; confirm details directly with the provider. See our editorial methodology and medical disclaimer.

Sources (checked October 2026)

• General health check-up preparation (Bangkok Hospital Pattaya)
• Prepare your visit, Health Screening Center (Bumrungrad International Hospital)
• Preparation for health check-up, Health Design Center (Bangkok Hospital)
• Pettersson et al., 2008: muscular exercise and liver function tests (Lund University record, British Journal of Clinical Pharmacology)
• FDA reminder on biotin interference with lab tests (TCTMD)
• Health check-ups in Thailand (Expatica)