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

The scope of this answer is “An immigration extension of stay using a fitness-to-work medical certificate”, so it covers both the requirements attached to this document set and the order the steps must follow. The terms that frame this page are immigration · extension · stay · using. The specifics here are purpose: Immigration; document type: Fitness, and those decide which translation and certification level applies. 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. A key variable is the filing channel (in person, agent or online), which sets the copy format to prepare. The most frequent cause of delay in this group is missing supporting documents on the first submission. Attach a document index to the bundle so nothing is lost during review. If the receiving body confirmed its requirements by email, keep that message with the file. Public holidays and embassy closures move certification queues more than most people expect. With a fixed filing date, count backwards from it and book each certification step in reverse. If any requirement is still unclear, send a sample image to the receiving body before producing the full set. 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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