💡 Vietnam's Circular 29/2018/TT-BYT requires informed consent forms and participant information sheets to be in Vietnamese and back-translated before ethics committee approval. The Investigator's Brochure and full protocol may stay in English, each with a Vietnamese summary attached. Getting translations into the pipeline early is the single biggest lever on approval timelines.
Key takeaways
- Informed Consent Forms (ICFs), participant information sheets, and the Volunteer Letter (Form 09) must be in Vietnamese, back-translated by an independent translator.
- The Investigator's Brochure and full protocol may stay in English, but each requires a Vietnamese summary for ASTT submission.
- Only the Northern (Hanoi) standard dialect is accepted; use the Ministry of Health official medical terminology glossary, not Southern Vietnamese vocabulary.
- Back-translation and cognitive debriefing with 5-8 patients are increasingly required by Vietnamese ethics committees: plan for both in your budget and timeline.
- Realistic approval timeline: 4-9 months from initial ASTT submission to site activation; translation delays are the most preventable cause of slippage.
Which documents must be in Vietnamese?
Clinical trial documents in Vietnam are governed by Circular 29/2018/TT-BYT, issued by the Ministry of Health. Article 20 states that all documents must be in Vietnamese or English. In practice, any document that a participant must read, understand, and sign requires Vietnamese. The table below maps each major document type to its language requirement:
| Document | Language requirement | Notes |
|---|---|---|
| Informed Consent Form (ICF) | Vietnamese - mandatory | Back-translation + ethics approval required |
| Participant Information Sheet | Vietnamese - mandatory | Back-translation required |
| Volunteer Letter (Form 09) | Vietnamese - mandatory | Per Circular 29/2018, Annex 09 |
| Protocol summary | Vietnamese - required | Full protocol may remain in English |
| Investigator's Brochure (IB) | English + Vietnamese summary | IB body may be English for ASTT |
| Full clinical protocol | English + Vietnamese summary | Summary required for ASTT submission |
| Serious Adverse Event reports | English acceptable | Vietnamese preferred for site-level reporting |
What is the two-stage approval pathway in Vietnam?
Vietnam uses two parallel tracks that both must clear before a trial can begin. The Administration of Science, Technology and Training (ASTT) under the Ministry of Health reviews the clinical trial application and the scientific dossier. Separately, the National Ethics Committee in Biomedical Research (NECBR), or an institutional ethics board, reviews all participant-facing materials.
The ASTT accepts English-language protocol documents with Vietnamese summaries. The ethics committee scrutinizes the ICF and participant information sheet, and will reject any document lacking a compliant Vietnamese translation with back-translation certification.
The most common planning mistake: submitting to ASTT while the ethics committee is still waiting for a compliant ICF. Starting translation and back-translation before the protocol is finalized prevents this. Realistic timelines: ethics review runs 2-4 months; ASTT technical review for a Phase II trial runs 3-5 months. Total time from initial submission to site activation is typically 4-9 months.
What does back-translation require for Vietnamese clinical trials?
Back-translation is the process of having an independent translator convert the Vietnamese document back into English. Independent means the back-translator has never seen the original source document. A reconciliation report then compares the back-translated version against the original, identifying any meaning shifts, omissions, or diacritical errors that affect meaning.
For Vietnamese clinical trial documents, back-translation is required for every patient-facing document: ICFs, participant information sheets, patient diaries, and patient-reported outcome (PRO) instruments. This requirement flows from both ICH E6(R3) Good Clinical Practice guidelines and WHO guidance on informed consent in clinical research.
Cognitive debriefing, which means testing the Vietnamese ICF with 5-8 representative members of the target patient population, has become standard practice at major Vietnamese trial sites. Vietnamese ethics committees increasingly expect a completed cognitive debriefing report as part of the submission package. It shortens review cycles and reduces amendment rounds.
Vietnamese language requirements that affect regulatory acceptance
Vietnamese has six tones in the Northern (Hanoi) standard, marked by five diacritic symbols. In medical writing, a missing or wrong diacritic changes the word's meaning. The word đau (pain) and a version written without its correct diacritics become entirely different words. Missing or wrong diacritics in an ICF are a compliance failure, not a formatting issue.
All regulatory submissions and participant-facing documents must use the Northern (Hanoi) standard dialect. The Ministry of Health publishes an official medical terminology glossary; translations that deviate from approved MoH terminology risk rejection at the ethics committee stage. Southern Vietnamese vocabulary and informal register are not acceptable in regulatory submissions.
- Unicode encoding (UTF-8): all Vietnamese text must use Unicode. Legacy encodings such as VISCII can strip diacritics in PDF export or database storage, producing unreadable text in the final printed document.
- Font coverage: fonts used in final PDFs must support Vietnamese Unicode precomposed characters across the Latin Extended Additional range (U+1E00-U+1EFF). Test this before finalizing the document template.
In-house vs. specialist: where does the line fall?
Your in-house team can manage the translation workflow: organizing the source document package, briefing a language service provider, tracking version control across protocol amendments, and coordinating the back-translation submission package. Standard operating procedures and site training manuals can often be handled through a qualified LSP under your team's direction.
The ICF, participant information sheet, and any PRO instruments are different. These require a Vietnamese medical translator who:
- Holds formal translation qualifications and understands ICH E6(R3) requirements for clinical document translation
- Is a native Northern Vietnamese speaker familiar with MoH official medical terminology
- Can produce the back-translation certification package that ethics committees require
- Has experience coordinating cognitive debriefing sessions with patient populations in Vietnam
A rejected ICF delays a trial by two to three months, often more. That cost exceeds the cost of professional medical translation several times over. For the full scope of Vietnamese clinical trial translation and document localization, the medical translation services page covers the end-to-end process.
FAQ
Does Vietnam accept English-language informed consent forms?
No. Informed consent forms must be in Vietnamese for participants to sign. Article 20 of Circular 29/2018/TT-BYT requires that participant-facing documents are understandable to the subject. Ethics committees will not approve an ICF that has not been translated into Vietnamese and back-translated for accuracy verification.
Which authority in Vietnam approves clinical trial documents?
Two bodies run in parallel. The Administration of Science, Technology and Training (ASTT) under the Ministry of Health approves the clinical trial application. The National Ethics Committee in Biomedical Research (NECBR) or an institutional ethics board approves participant-facing materials including ICFs. Both must approve before a trial can begin at any site.
What is the primary regulation governing clinical trials in Vietnam?
Circular 29/2018/TT-BYT, issued October 29, 2018, is the primary regulation governing clinical trial conduct in Vietnam. It incorporates ICH E6(R2) Good Clinical Practice standards and was aligned with ICH E6(R3) elements in 2024 guidance updates from the Ministry of Health.
How long does clinical trial document approval take in Vietnam?
For a straightforward Phase II or III trial, the realistic timeline from initial ASTT submission to site activation is 4-9 months: ethics review typically takes 2-4 months; the ASTT technical review runs 3-5 months. Translation delays are the most preventable source of slippage and often push timelines into the longer end of that range.
Is back-translation mandatory for all clinical trial documents in Vietnamese?
Back-translation is mandatory for all patient-facing documents: ICFs, participant information sheets, patient diaries, and PRO instruments. It is not required for the full protocol or Investigator's Brochure, which regulators review in English with a Vietnamese summary. However, back-translation is strongly recommended for any document that participants will sign.
Official Sources
- Vietnam for Clinical Trials 2026: Regulatory Landscape - Credevo - Overview of Circular 29/2018/TT-BYT, ASTT approval pathway and language requirements. Verified Nov 2026.
- ICH Efficacy Guidelines (E6 GCP) - ICH E6(R3) Good Clinical Practice; informed consent and back-translation requirements. Verified Nov 2026.
- NIAID ClinRegs: Vietnam - Vietnam clinical trial regulatory overview; ASTT and MoH approval pathway. Verified Nov 2026.
- Back-Translation in Clinical Trials - Global LTS - WHO and ICH E6 back-translation methodology requirements. Verified Nov 2026.
- GCP Inspection Checklist for Vietnam - PMC/NCBI - GCP inspection criteria for Vietnamese clinical trial sites; MoH requirements. Verified Nov 2026.
Written by Dao Huy (Lucas), Vietnamese translator and localization specialist (English, Chinese and French into Vietnamese). See translation services →