What do I need for a medical certificate? Check your documents before you come
A checklist of ID, forms and the questions to ask the receiving organisation before coming for a medical certificate.
Medical certificates all look much the same, but what each organisation wants to see inside differs. You save the most time by asking the recipient before you come: do they need their own form, what must be examined, and will they accept a certificate from a clinic?
Key takeaways
- Bring your original ID card, passport or other identity document.
- Bring the form from your company, school or organisation, if there is one.
- State the real purpose, because the doctor must examine and certify according to the facts.
- For specific items such as an X-ray or drug test, check first whether the clinic can provide them.
Basic documents to prepare
- ID card, passport or identity document with your name spelled the same as on the document you'll submit
- The original form or file the organisation requires, and check whether it needs a photo
- The purpose in detail: job application, study, sick leave, driving licence or another transaction
- Treatment history, current medication and relevant previous results, if the organisation has specific health conditions
Why send the form to the clinic first
'Medical certificate' covers many kinds of document. Some organisations use a general form; others specify items or ask for extra results such as eyesight, a chest X-ray or laboratory tests. The clinic may not offer every service on site.
Sending clear photos of every page of the form on LINE before you come lets our team check the scope of service, timing and preparation, though we cannot guarantee the outcome of the certification in advance.
What the doctor must do before issuing
The doctor must take a history, examine you and record the findings as appropriate. A certificate cannot be bought as a form or signed without an examination, and the doctor cannot certify anything that cannot be verified.
If you want a sick-leave certificate for earlier days, bring evidence of previous treatment to discuss, but the doctor may not be able to certify past events without sufficient information. The decision rests on the facts and medical judgement.
Good to know: Before leaving the clinic, check your name, ID number, purpose, date and the English spelling straight away.
4 questions to ask the receiving organisation
- Is there a mandatory form, or is a general one acceptable?
- Which items must be examined?
- How many days is the certificate valid from the examination date?
- Do you need the original, a copy, a photo or an additional stamp?
Frequently asked questions
A general form may work for some purposes, but ask the company or organisation first, because the clinic cannot confirm on their behalf.
Related services
Sources
- Medical certificate form approved by the Thai Medical Council, 2018 Department of Disease Control, Ministry of Public Health
This content is general information and does not replace an examination, diagnosis or personal advice from a doctor. Published 1 July 2026
Everyone's health is different
If you have a health condition, take regular medication, are pregnant or have unusual symptoms, let a doctor assess you first. Message us on LINE.
