An immigration extension of stay using a fit-to-fly medical certificate — how should the document set be assembled?

The scope of this answer is “An immigration extension of stay using a fit-to-fly medical certificate”, so it deals with the case-specific points first and the shared rules afterwards. With a fixed filing date, count backwards from it and book each certification step in reverse. If multiple certified sets are needed, order them all in the first round to avoid re-queuing. Attach a document index to the bundle so nothing is lost during review. Note who signed each certification and on what date for later reference. After certification, scan the full set before it leaves your hands. The specifics here are purpose: Immigration; document type: Fittofly, and those decide which translation and certification level applies. The terms that frame this page are immigration · extension · stay · using. What sets this case apart is the number of certified sets and the window in which they must be used. The deciding factor is the receiving body's requirement, not only the format of the Thai-side document. Before starting, check that names are spelled identically to the passport or ID card on every page, then confirm with the receiving body whether it wants an original, a certified copy or a certified translation, then count the number of certified sets needed before work starts, because extra sets restart the certification steps. Medical documents are issued only by the examining doctor or the treating facility. A translation provider cannot issue, amend, supplement or make any clinical judgement; its role is to render the source text in full — letterhead, hospital seal, signature block, practitioner licence number and dates included. A medical certificate for employment, a work permit or a visa is usually required on the receiving body's own form, and many bodies set a validity period counted from the examination date. Reading the destination's requirements before the examination avoids repeating it because the wrong form was used or the certificate has expired. A medical translation must preserve the diagnosis, disease codes, drug names, dosages, units and result values exactly as written — no rounding, no unit conversion, no summarising. Where the original is illegible handwriting, the facility should be asked for a typed version or a written confirmation rather than the meaning being guessed. Cost and lead time depend on page count, the density of clinical terminology, the target language and the certification steps required, so every file is quoted before work starts. Send scans of the medical paperwork together with the written requirements from the hospital, insurer or receiving authority via LINE @NAATI, call +66 80-557-8887 or email ilc@thainotary.co.th.

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