What a Thai Medical Certificate Covers: Work Permits, Driving Licences and Sick Leave

You have sorted your work permit, found a place to live in Pratumnak or Naklua, and then someone tells you the application needs a medical certificate from a licensed Thai doctor. Or maybe you are renewing your driving licence at the DLT office and the counter staff hand you a checklist you were not expecting. It is a minor admin step, but it is easy to get wrong if you show up without the right documents or go to a clinic that cannot issue the correct form.

This guide covers exactly what each type of Thai medical certificate includes, what the doctor checks, what you need to bring, and how the process works at a walk-in clinic in Pattaya. No queues at a government hospital, no appointment weeks away.

The Main Types of Medical Certificate Foreigners Ask For

There are three situations that bring most people through the door: a driving licence medical, a work permit health check, and a sick-leave note for an employer or insurer. They are not the same document and they do not involve the same examination.

Thai Driving Licence Medicals

The Department of Land Transport (DLT) requires a medical certificate when you apply for or renew a Thai driving licence. The certificate must be on a Thai Medical Council approved form and signed by a licensed doctor. The DLT will not accept a plain letterhead note or a photocopy.

The examination is straightforward. The doctor checks your blood pressure, general physical fitness, and confirms you have no conditions that would affect your ability to drive safely. Colour vision may be assessed for first-time applicants; from 2026 the DLT removed the colour-vision requirement for licence renewals. No blood tests are required for a driving licence medical. Most patients are in and out within twenty minutes.

Work Permit and Employment Medicals

A work permit medical certificate is required by the Department of Employment when you apply for or renew a Non-Immigrant B visa and work permit. This one is more involved than a driving licence check.

The doctor screens for the conditions specified under Thai law, including leprosy, tuberculosis, elephantiasis, drug addiction, alcoholism, and syphilis, the last confirmed by a VDRL blood test, as well as confirming the applicant is of sound mind and free from mental infirmity. Do not let that list alarm you. These are the statutory screening conditions, and the examination is a standard health check. If your VDRL comes back clear and there are no clinical signs of the other conditions, you receive your certificate. That is usually within a day or two once the lab result is back. The certificate is issued in a format compatible with the e-Work Permit system used by the Department of Employment.

Sick-Leave Notes and Employer Letters

A sick-leave note is the most informal of the three. If you have been unwell, missed work, or need documentation for a foreign employer or travel insurer, the doctor writes a clinical summary on clinic letterhead. It includes the date of the visit, the diagnosis or presenting complaint, and the recommended rest period.

This is not the same as a formal medical certificate. If your insurer or employer requires a stamped certificate rather than a clinical note, say so at the time of booking. Getting the format wrong can delay an insurance claim, so it is worth a quick check before the appointment. Doctor Pattaya can tailor the letter to match what your insurer actually needs, including diagnosis codes, treatment dates, and fitness-to-travel status where relevant.

What the Doctor Usually Checks and Tests

For a driving licence medical, expect a physical check covering blood pressure and general fitness. Colour vision may be assessed for first-time applicants but is no longer required for renewals following the 2026 DLT rule change. For a work permit medical, the doctor adds a VDRL blood test for syphilis, a clinical assessment for signs of leprosy, tuberculosis, and elephantiasis, and a brief screening for drug and alcohol dependency.

Only syphilis requires a blood test at this stage. The other five conditions are assessed clinically. A chest X-ray may be requested in some contexts, particularly for certain visa categories, but it is not automatically part of a standard work permit medical. Confirm with the clinic in advance if your application requires one.

Documents You Should Bring

Bring your original passport, not a photocopy. For a driving licence medical, you will also need proof of your Thai address. A utility bill, lease agreement, or residence certificate from your local district office all work. Without a proof-of-address document, the certificate may not be accepted at the DLT counter.

For a work permit medical, bring your passport and your company name and address in Thai, so the doctor can complete the certificate correctly. For a sick-leave note, your passport or ID is enough.

If you need a medical certificate for an O-A retirement visa extension, the requirements can differ depending on whether you are applying in Thailand or at a Thai embassy overseas. Certificates issued in Thailand are accepted for in-country extensions at Thai immigration. If you are applying at an overseas embassy, confirm with that embassy before coming to any Pattaya clinic, as some require a certificate issued by a doctor in your country of residence.

Language, Validity and Same-Day Letters

Thai medical certificates can be issued in Thai, in English, or bilingually. For DLT and Department of Employment applications, Thai is required. For foreign employers and international insurers, English is usually preferred. At Doctor Pattaya, certificates are issued bilingually as standard, covering both requirements in one document.

The standard validity period is thirty days from the date of issue. Some government offices apply tighter requirements, so do not get the certificate too far ahead of your application date. For a sick-leave note, there is no formal expiry, but presenting a note dated several weeks after the illness will raise questions with an employer or insurer.

For a driving licence medical or sick-leave note, the certificate is typically ready the same day. For a work permit medical, same-day issue depends on how quickly the VDRL result comes back. At a private clinic in Pattaya, that is usually within twenty-four hours.

How This Differs From a Fit-to-Fly or Visa Medical

A standard Thai medical certificate and a fit-to-fly letter are not the same thing and cannot substitute for each other.

A fit-to-fly letter is an airline or insurer requirement. It confirms you are medically safe to travel by air, typically after surgery, a significant illness, a late-stage pregnancy, or when a chronic condition needs to be documented for the flight crew. The criteria are different from those in a work permit or driving licence medical. Both can be completed in a single appointment at Doctor Pattaya, so if you need both before you travel, you do not need two separate clinic visits.

A medical clearance letter for a Non-Immigrant OA visa extension covers general health fitness and the absence of the six prohibited conditions. It is similar in content to a work permit certificate but addressed to immigration rather than the Department of Employment. The same appointment and the same blood test cover both if your situation requires them.

If you have been dealing with something else while you are here, whether it is a skin rash after a day at the beach or a fever that came on after a few nights out, the same clinic visit can cover both the medical issue and the certificate. There is no need to book separately.

For anyone staying near Jomtien or along the south end of town, the Doctor Pattaya Jomtien service covers hotel visits and walk-in consultations in that area, including medical certificate appointments. If you are up in Naklua or Wong Amat and need this sorted quickly, the Doctor in Naklua page has the details.