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Wellness Prevention

5 Things to Avoid Before Your Medical Check Up

Dr Poh Kah
Virtue Medical Content Team
Medically reviewed by Dr Poh Kah — Written by Virtue Medical Content Team — Updated on 3 September 2026
5 mins read

Key Takeaways

  • Avoid heavy meals, strenuous exercise, alcohol, smoking, and unnecessary changes to your usual routine before a medical examination unless your doctor gives different instructions.

  • Preparation depends on the tests included, so not every medical check up requires fasting.

  • If you are attending a medical check up for work permit, follow the employer, government, or clinic requirements carefully.

  • Bring relevant identification, medical records, medication details, and any forms required for your examination.

5 Things to Avoid Before Your Medical Check Up

A medical check up can help assess your general health and identify conditions that may require further evaluation.

For people preparing for a medical check up for work permit, following the clinic's instructions is particularly important because specific tests may be required before employment or work authorization. In most cases, you should avoid heavy meals, alcohol, strenuous exercise, smoking, and unnecessary changes to your normal routine before the appointment.

1. Avoid Eating a Heavy Meal When Fasting Is Required

Some blood tests require fasting, meaning you should avoid food for a specified period before the test. Eating can temporarily change levels of glucose, triglycerides, and other substances measured in the blood [1].

Not every medical examination requires fasting. If you are attending a medical check up for work permit, check the clinic's instructions before skipping breakfast. Fasting when it is unnecessary can make you uncomfortable and may not provide any additional benefit.

Do not stop prescribed medication unless a healthcare professional specifically advises you to do so.

2. Avoid Alcohol Before Your Appointment

Alcohol can affect several measurements and may contribute to dehydration. Avoiding alcohol before an examination is therefore a sensible precaution, particularly when blood tests are included [2].

This is also relevant when preparing for a medical check up for work permit. The goal is to obtain results that reflect your health as accurately as possible rather than temporary changes associated with recent alcohol consumption.

3. Avoid Strenuous Exercise Immediately Before Testing

Physical activity is an important part of a healthy lifestyle, but intense exercise shortly before some tests may temporarily affect certain results [3]. If you are preparing for a medical check up for work permit, maintain your usual activity level and avoid making major changes simply to influence the examination.

Your clinician needs an accurate picture of your health rather than a result affected by an unusually demanding workout.

4. Avoid Smoking Immediately Before the Check Up

Smoking can temporarily affect heart rate, blood pressure, oxygen levels, and other measurements [4]. If you smoke regularly, be honest with your healthcare professional rather than trying to conceal your smoking history. This information may be important when interpreting results and assessing your overall health.

For a health check up for work permit, you should also follow any specific instructions from the clinic regarding smoking or vaping before testing. Requirements can differ depending on the examination and tests involved.

5. Avoid Changing Your Routine or Medication Without Advice

Trying to produce a “better” result by suddenly changing your diet, stopping medication, taking supplements, or altering your normal routine can make results less representative of your usual health [5].

Continue prescribed medicines unless your doctor or testing centre has instructed you otherwise. Tell the clinic about prescription medicines, over-the-counter products, vitamins, and supplements you take.

For a medical assessment for work permit, this is especially important because certain assessments may require information about your existing health conditions and medications. Do not withhold relevant medical information simply because you are concerned it could affect your assessment.

What Should You Do Instead?

Good preparation does not mean trying to manipulate your results. It means following the clinic's instructions and arriving in a condition that allows the healthcare professional to assess you accurately.

Preparation

What to Do

Fasting

Follow the clinic's specified fasting period if required

Water

Ask whether you may drink plain water

Medication

Confirm whether regular medicines should be taken

Exercise

Avoid unusually strenuous activity immediately beforehand

Alcohol

Avoid it according to the clinic's instructions

Documents

Bring identification, forms, and relevant medical records

Confirm whether your employer, immigration authority, or clinic has provided additional requirements.

What Happens During a Work Permit Medical Examination?

A medical check up for work permit may involve a medical history, physical examination, chest X-ray, blood tests, urine testing, or other assessments depending on the applicable requirements [6].

The healthcare professional may ask about previous illnesses, current symptoms, medications, and relevant medical history. You may also have your height, weight, blood pressure, and other basic measurements recorded.

If a result is outside the expected range, it does not automatically mean that you have a serious condition or that you cannot work. Temporary factors, underlying conditions, or differences between individuals can affect test results. Further evaluation may be recommended when appropriate.

How Can You Make the Appointment Easier?

These steps help you arrive prepared and make the examination efficient.

Get enough sleep the night before, wear comfortable clothing, arrive on time, and bring any requested documents.

If fasting is required, ask how long you need to fast and whether plain water is allowed. If you are unsure about medication, supplements, or other preparation requirements, contact the clinic before your appointment instead of making assumptions.

When completing a medical check up for work permit, provide accurate information and follow the instructions given by the examining clinic. This helps prevent avoidable delays and ensures that the assessment is based on reliable information.

Conclusion

Preparing for a work permit medical examination is usually straightforward. The most important steps are to follow the clinic's instructions, avoid alcohol and unusually strenuous exercise, avoid smoking immediately before testing, and avoid changing prescribed medication or your normal routine without professional advice.

If you are preparing for the examination, check the exact requirements in advance because the tests and preparation instructions can vary. When in doubt, contact the clinic and ask what you should eat, drink, take, or avoid before your appointment.

A well-prepared examination gives healthcare professionals a more accurate picture of your current health and can help the process proceed smoothly.

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