Back translation is the process of taking a document that has already been translated into a target language and translating it back into the original language, using an independent linguist who has not seen the source text. The resulting back-translated version is then compared against the original to identify any discrepancies in meaning, intent, or terminology.
Global LTS provides ISO 17100:2015 certified back translation services across 120+ languages, with particular expertise in clinical trial documentation, pharmaceutical regulatory submissions, patient-reported outcome instruments, and other regulated content where independent verification of translation accuracy is a formal requirement.
Back translation is not a standard quality assurance step for all translation projects. It is a specific verification method required in contexts where the accuracy of a translation cannot be assessed by the commissioning party, and where a mistranslation carries regulatory, clinical, or legal consequences.
The most common contexts where back translation is formally required or strongly recommended include:
A properly executed back translation requires strict separation between the forward translation and back translation stages. The back translator must not have access to the original source document during their work. This independence is what makes the comparison meaningful.
Our standard back translation workflow follows four stages:
A subject-specialist translator produces the initial translation of the source document into the target language. For clinical and pharmaceutical content, this translator holds relevant scientific or medical qualifications in addition to their linguistic credentials.
A second, independent translator with no access to the original source document translates the target language version back into the source language. The back translator is selected specifically for their independence from the forward translation process.
A project manager or senior linguist conducts a structured comparison of the original source text and the back-translated version, identifying any passages where meaning, intent, or terminology diverges. Discrepancies are categorised and assessed for significance. Where a discrepancy indicates a genuine translation error in the forward translation, the forward translation is revised and the relevant passage back-translated again.
The full back translation package is compiled for client delivery. This includes the forward translation, the back translation, a comparative discrepancy report, and where required, a reconciliation commentary explaining how discrepancies were assessed and resolved. This documentation supports regulatory submissions, ethics committee review, and internal quality audit requirements.
The WHO’s guidelines on translation and adaptation of instruments set out the requirements for back translation in clinical and research contexts. The core principle is that back translation must be performed by an independent translator who is a native speaker of the source language, working blind to the original text, with any identified discrepancies formally assessed and resolved before the instrument is used.
ICH E6(R2) Good Clinical Practice requirements reinforce the importance of translation accuracy in clinical trial documents, particularly for patient-facing materials where a misunderstood consent form or ambiguous patient diary instruction can affect data integrity and patient safety.
Global LTS’s clinical translation team has experience working within these frameworks and can produce back translation packages formatted to meet the documentation requirements of ethics committees, institutional review boards, and regulatory authorities.
For more detail on our clinical and pharmaceutical translation capabilities, visit our medical translation services page.
Back translation is a quality verification tool, not a guarantee of perfect equivalence. Because languages differ in grammar, syntax, idiom, and conceptual structure, a back translation will never be word-for-word identical to the original. That is expected and does not in itself indicate an error.
What back translation reliably identifies is substantive divergence: a translated passage that, when rendered back into the source language, produces a different meaning from the original. That divergence is the signal that the forward translation may need review.
For this reason, back translation is most useful as one component of a broader quality assurance process, particularly for complex or sensitive content. It complements ISO 17100:2015 independent revision rather than replacing it.
To discuss your back translation requirements or request a free quote, contact our team with your source document, language pair, and intended use. We will confirm the appropriate workflow and turnaround within the hour during business hours.
Back translation is the process of taking a document that has already been translated into a target language and translating it back into the original language, using an independent linguist who has not seen the source text. The resulting back-translated version is then compared against the original to identify any discrepancies in meaning, intent, or terminology.
Global LTS provides ISO 17100:2015 certified back translation services across 120+ languages, with particular expertise in clinical trial documentation, pharmaceutical regulatory submissions, patient-reported outcome instruments, and other regulated content where independent verification of translation accuracy is a formal requirement.
Back translation is not a standard quality assurance step for all translation projects. It is a specific verification method required in contexts where the accuracy of a translation cannot be assessed by the commissioning party, and where a mistranslation carries regulatory, clinical, or legal consequences.
The most common contexts where back translation is formally required or strongly recommended include:
A properly executed back translation requires strict separation between the forward translation and back translation stages. The back translator must not have access to the original source document during their work. This independence is what makes the comparison meaningful.
Our standard back translation workflow follows four stages:
A subject-specialist translator produces the initial translation of the source document into the target language. For clinical and pharmaceutical content, this translator holds relevant scientific or medical qualifications in addition to their linguistic credentials.
A second, independent translator with no access to the original source document translates the target language version back into the source language. The back translator is selected specifically for their independence from the forward translation process.
A project manager or senior linguist conducts a structured comparison of the original source text and the back-translated version, identifying any passages where meaning, intent, or terminology diverges. Discrepancies are categorised and assessed for significance. Where a discrepancy indicates a genuine translation error in the forward translation, the forward translation is revised and the relevant passage back-translated again.
The full back translation package is compiled for client delivery. This includes the forward translation, the back translation, a comparative discrepancy report, and where required, a reconciliation commentary explaining how discrepancies were assessed and resolved. This documentation supports regulatory submissions, ethics committee review, and internal quality audit requirements.
The WHO’s guidelines on translation and adaptation of instruments set out the requirements for back translation in clinical and research contexts. The core principle is that back translation must be performed by an independent translator who is a native speaker of the source language, working blind to the original text, with any identified discrepancies formally assessed and resolved before the instrument is used.
ICH E6(R2) Good Clinical Practice requirements reinforce the importance of translation accuracy in clinical trial documents, particularly for patient-facing materials where a misunderstood consent form or ambiguous patient diary instruction can affect data integrity and patient safety.
Global LTS’s clinical translation team has experience working within these frameworks and can produce back translation packages formatted to meet the documentation requirements of ethics committees, institutional review boards, and regulatory authorities.
For more detail on our clinical and pharmaceutical translation capabilities, visit our medical translation services page.
Back translation is a quality verification tool, not a guarantee of perfect equivalence. Because languages differ in grammar, syntax, idiom, and conceptual structure, a back translation will never be word-for-word identical to the original. That is expected and does not in itself indicate an error.
What back translation reliably identifies is substantive divergence: a translated passage that, when rendered back into the source language, produces a different meaning from the original. That divergence is the signal that the forward translation may need review.
For this reason, back translation is most useful as one component of a broader quality assurance process, particularly for complex or sensitive content. It complements ISO 17100:2015 independent revision rather than replacing it.
To discuss your back translation requirements or request a free quote, contact our team with your source document, language pair, and intended use. We will confirm the appropriate workflow and turnaround within the hour during business hours.
Yes, back translation is often used to meet legal and regulatory requirements. It provides a clear, documented record that can be used to demonstrate the accuracy of translations, which is crucial in sectors like healthcare, pharmaceuticals, and finance where compliance with international standards and regulations is mandatory.
Back translation at Global LTS is carried out by expert linguists who have no prior knowledge of the original translated document. This ensures an unbiased translation. Our team consists of highly qualified professionals with deep expertise in their respective industries, such as medical, legal, and financial sectors, ensuring accuracy and cultural fluency.
No, back translation does not aim to produce an identical, word-for-word replica of the original text. Due to the inherent differences in languages, the focus is on ensuring that the meaning, intent, and critical information are accurately conveyed. The goal is to maintain the integrity and purpose of the original message, even if the phrasing differs.
We cover over 120 languages. Below are the most frequently requested languages: