Receiving Notified Body comments on clinical evaluation documentation is one of the more time-pressured situations in the EU MDR compliance process. Response windows are typically short, the comments are often technical, and the consequences of a poorly structured response can extend the review process significantly. A systematic approach — starting with triage rather than drafting — is almost always faster than responding comment by comment.

Step 1: Triage before you write anything

Notified Body comments on clinical evidence fall into broadly different categories, and the right response depends on which type you are dealing with. Before drafting anything, classify each comment:

  • Procedural or formatting comments — a section is missing, a reference is incomplete, the document does not follow the required structure
  • Clarification requests — the reviewer could not follow the logic; the response needs to make the existing reasoning clearer, not necessarily add evidence
  • Evidence gap comments — the reviewer has identified that clinical data is insufficient, missing, or not adequately supporting a specific claim or conclusion
  • Consistency comments — the CER contradicts another document in the technical file (IFU, risk management file, SSCP)

The response strategy differs for each. Evidence gap comments are the most resource-intensive and may require sourcing additional literature, restructuring sections, or commissioning PMCF activities. Identify these first so you can assess whether the response deadline is realistic.

Step 2: Map each comment to its source document

Notified Body questions on the CER often have implications for other technical file documents. A comment on the benefit-risk section may require revisions to the risk management file. A comment on the PMCF plan may require revisions to the CER's clinical data section. Before drafting responses, map each comment to every document that will need to be revised — not just the primary document the comment references.

This mapping step prevents the situation where a CER response is submitted and accepted, and then a subsequent audit identifies inconsistencies with the PMCF plan that should have been addressed at the same time.

Step 3: Build a response table

The most effective format for Notified Body responses is a structured response table: original comment, your response, revised text or reference to the revised section, and document version. This format gives the reviewer everything they need to close the comment in one place, and it provides a clear audit trail for your own records.

The response text itself should be concise and evidence-referenced. Avoid vague language ("the section has been updated to address this comment") without specifying what was changed and why. Cite relevant standards — MEDDEV 2.7/1 rev 4, ISO 14971, EN ISO 20417 — where the reasoning draws on a normative requirement.

Step 4: Check consistency across the revised technical file

Before submitting the response package, run a consistency check across all revised documents. Notified Bodies frequently identify inconsistencies that arise from responding to one document without updating related documents — the classic example being a benefit-risk summary that is updated in the CER but not reflected in the SSCP.

At minimum, check that the intended purpose, claims, residual risks, and benefit-risk conclusions are stated consistently across the CER, risk management file, IFU, and any SSCP or PMCF documentation that references them.

Timeline management

If the scope of revisions required cannot be completed within the response window, contact the Notified Body early. Most Notified Bodies will grant extensions for substantive revision work, particularly where evidence gap comments require new literature review or PMCF design. Requesting an extension before the deadline — with a specific revised submission date — is considerably better than submitting an incomplete response or missing the deadline without notice.

For teams managing Notified Body correspondence for the first time, or dealing with a high volume of comments across multiple documents, engaging specialist regulatory writing support at the triage stage — before drafting begins — typically results in a more focused, faster response process.