If you’re running a clinical trial for a medical device, you’ll quickly come across the term electronic Trial Master File, or eTMF. It’s one of the most important elements of your study, and getting it right from the start can save you significant time and headache later on.
What Is An eTMF?
An eTMF is the complete electronic collection of documents that records how your clinical trial was planned, conducted and managed. Think of it as the official paper trail for your study, just digital. It exists to demonstrate that your trial was run to the required standards, that participants were protected, and that the data generated can be trusted.
Why Does It Matter?
Regulators, sponsors and auditors refer to the eTMF to verify that your study complied with Good Clinical Practice (GCP), ISO 14155 and any applicable national requirements. If your trial is ever inspected, the eTMF is what they will ask for first.
Beyond inspection readiness, a well-maintained eTMF is simply good clinical governance. It gives everyone involved in the trial, from your clinical team to your regulatory affairs team, a single source of truth for how the study was run.
What Does It Contain?
The eTMF is typically split into two parts.
The Investigator Site File (ISF) sits at the clinical site and contains everything relevant to how the trial was run on the ground. This includes staff training records, informed consent documentation, protocol versions and any correspondence relating to the site.
The Sponsor Trial Master File (TMF) sits with the sponsor and covers the broader oversight of the study. This includes regulatory approvals, ethics committee correspondence, contracts, monitoring reports and safety reporting documentation.
Together, these two files tell the complete story of your trial from first planning through to close-out.
When Should You Start It?
As early as possible. Many companies make the mistake of treating the eTMF as something to pull together at the end of a study. In reality, it should be a living record that’s built and maintained throughout. Documents should be filed in real time, version control should be observed, and responsibility for maintaining the file should be clearly assigned from day one.
Starting early also means that if your study design changes, or if you face an inspection mid-trial, you’re not scrambling to reconstruct documentation after the fact.
The Bottom Line
An eTMF is not just a regulatory box to tick. It’s the foundation of a credible, inspection-ready clinical study. Getting it set up correctly and maintaining it throughout your trial protects the integrity of your data and strengthens your regulatory submission, whether that’s with the FDA, under EU MDR, or both.
If you’re unsure where to start with your eTMF, or want to make sure your existing file is fit for purpose, contact us here.
