Trial master file: filed as you go, or reconstructed under inspection

The trial master file is the collection of essential documents that allows the conduct of a clinical trial and the quality of the data produced to be evaluated. It exists so that somebody who was not there can reconstruct what was done, by whom, under what approvals, and whether the protocol was followed.

Its defining requirement is not completeness at the end but contemporaneity throughout. Documents are supposed to be filed as they arise, so that at any moment the file reflects the state of the trial. A file assembled in the weeks before an inspection may contain everything and still fail, because the timeliness of filing is itself part of what is assessed.

What a working trial master file looks like

• A defined structure, commonly based on the widely used reference model, agreed before the first document is filed.
• Sponsor and site files with a clear split, and a plan stating who holds what.
• Filing at the point documents arise, with the date they were filed visible.
• Version control on documents that change — the protocol, the consent form, the investigator brochure.
• A defined list of what is expected for this trial, so absence can be distinguished from not-yet-due.
• Quality checks: completeness against the expected list, timeliness against the filing standard, and legibility.
• A plan for archiving at the end, for the retention period applicable to the trial.

Expected, missing and not applicable are three different states

The most useful thing a TMF can do is distinguish between a document that has not arisen yet, one that will never arise for this trial, and one that should exist and does not. Files that record only what is present cannot answer the question an inspector actually asks, and the team ends up reconstructing the expected list under pressure. Define it at study start and maintain it as the trial changes.

Electronic trial master file systems used to hold the file are regulated software: they require validation, audit trails and controlled access. That is a genuine constraint, not a vendor talking point, and it is why the file cannot simply live in a shared drive.

Metrics that mean something

Completeness alone is a lagging and flattering measure. The pair worth tracking is completeness against the expected document list and timeliness — the interval between a document being dated and being filed. A trial with ninety-five per cent completeness and a median filing lag of two months has a problem that the completeness figure conceals, and it is the lag that inspection findings usually name.

The documents around the file

Ettex Records keeps the study-level records that sit outside a validated system — the expected-document plan, the filing standard, quality review results and the archiving plan — with dates visible, and Ettex Docs holds the working drafts of documents before they are approved and filed. The instrument the study collects data on is covered in case report form, and the participant-facing document in informed consent form.

To be explicit: this is not an eTMF and must not be used as one. The essential documents of a trial belong in a validated system with audit trails; what this covers is the planning and oversight around it, and none of it is regulatory advice.