Declaration of Conformity (DoC) is a legally binding document in which a medical device manufacturer states, under its own responsibility, that a device meets all applicable regulatory requirements. Under EU MDR 2017/745, the DoC is required by Article 19, its content follows Annex IV, and it is the prerequisite for affixing the CE mark.
What is a Declaration of Conformity (DoC)?
The Declaration of Conformity is the manufacturer’s formal, signed statement that a device satisfies every legal requirement that applies to it. It sits at the end of the conformity assessment route, after design controls, risk management, and, for most classes, notified body involvement are complete. Drawing it up is the act that lets the manufacturer place the device on the market.
The term carries two distinct meanings depending on jurisdiction. In the EU, the EU Declaration of Conformity is a mandatory regulatory instrument tied to CE marking. In the United States, a DoC is a voluntary submission element: a manufacturer may declare conformity to an FDA-recognized consensus standard inside a premarket submission to reduce the test data it has to supply.
Why the Declaration of Conformity (DoC) matters in medical device development
Without a valid DoC, a device cannot be CE marked and cannot legally be sold in any EU member state. That makes it a hard gate on market access, not a formality. The document also concentrates on legal accountability: by signing it, the manufacturer accepts responsibility for compliance across the whole regulation, not only the parts a notified body reviewed.
Auditors and competent authorities treat the DoC as an entry point into the technical documentation. A declaration that names the wrong regulation version, omits the Basic UDI-DI, or contradicts the risk class in the technical file signals weak document control and invites deeper scrutiny. Because the manufacturer must keep the DoC current, a device change that is not reflected in an updated declaration can turn into a nonconformity during surveillance.
How the Declaration of Conformity (DoC) works
Under EU MDR 2017/745, Article 19 sets the obligation, and Annex IV sets the minimum content. A compliant EU Declaration of Conformity typically includes:
- Manufacturer name, address, and Single Registration Number (SRN).
- The Basic UDI-DI and enough product identification to trace the device.
- A statement that the DoC is issued under the manufacturer’s sole responsibility.
- The device risk class and the conformity assessment route are applied.
- References to the standards and common specifications used, plus the notified body and certificate numbers where a notified body was involved.
- The place and date of issue, and the signature of an authorized signatory.
The declaration must be translated into the languages required by each member state where the device is sold, and it has to be kept available for competent authorities for the retention period set in the regulation. For in vitro diagnostics, the parallel obligation sits in EU IVDR 2017/746, Article 17.
The FDA route works differently. A manufacturer conforming to an FDA-recognized consensus standard may submit a declaration of conformity within a 510(k), De Novo, or PMA, citing each standard by its FDA recognition number. FDA guidance built on ISO/IEC 17050-1 describes what that declaration should contain. FDA can then rely on the declared conformance to satisfy part of the review, which lowers the supporting data burden.
Common challenges and best practices
The most frequent error is treating the DoC as a one-time template rather than a controlled, living document. When labeling, standards, or the device configuration changes, teams often forget to reissue them. Keep the declaration under the same change control as the rest of the technical file, and tie its revision to the design history.
Version drift is the second common problem: citing a superseded standard edition or an outdated regulation reference. Verify each cited standard against the current recognized list before signing. A third issue is inconsistency between the DoC and the technical documentation, for example, a risk class or intended purpose that does not match. Reconcile the declaration against the file whenever either one changes, and name a signatory who understands what the signature commits the company to.
How SJML helps with Declaration of Conformity (DoC)
Syrma Johari MedTech supports the full path that leads to a Declaration of Conformity through its Compliance-as-a-Service model. SJML teams handle device classification, regulatory strategy, and conformity assessment planning for EU MDR and IVDR, along with 510(k) and CE marking submissions. They build and maintain technical documentation and design history files, align quality systems to ISO 13485, and structure risk management to ISO 14971 so the declaration rests on evidence that holds up under audit. Support extends to keeping the declaration and its underlying file current as devices change.
Frequently asked questions
The manufacturer is solely responsible for the EU Declaration of Conformity. It must be signed by a person authorized to commit the manufacturer, and by signing, the company assumes legal responsibility for the device’s compliance with EU MDR 2017/745. An authorized representative does not sign it, though they keep a copy available for competent authorities.
No. A CE certificate is issued by a Notified Body after it assesses a device or quality system. The Declaration of Conformity is issued by the manufacturer itself. For most device classes, the manufacturer references the notified body certificate inside the declaration, but the two documents have different authors and different legal roles.
Annex IV of EU MDR 2017/745 sets the minimum content:
Manufacturer details and SRN
The Basic UDI-DI
A statement of sole responsibility
The device risk class
The standards and common specifications are applied.
Any notified body and certificate numbers.
The date, place, and authorized signature
It must be translated into the languages each relevant member state requires.
No, it is voluntary. In the United States, a Declaration of Conformity is an optional way to show a device meets an FDA-recognized consensus standard within a premarket submission. Citing standards by their FDA recognition number lets the agency rely on that conformance and can reduce the test data a manufacturer needs to submit.
Related terms
- CE Marking
- Conformity Assessment
- Technical Documentation
- Notified Body
- EU MDR 2017/745
