A CER systematically appraises and analyses clinical data to verify clinical safety, performance, and the clinical benefit-risk profile of a device under MDR Annex XIV. It must be updated throughout the device lifecycle. The CER follows a clinical evaluation plan and draws on clinical investigations, literature and post-market data, including PMCF. MEDDEV 2.7/1 rev 4 is still widely used for structure, with MDCG guidance covering equivalence and sufficient clinical evidence. Notified bodies review the CER during conformity assessment, and it must be updated with PMS and PMCF findings, at least annually for Class III and implantable devices.

Why it matters

MDR raised the clinical-evidence bar substantially over MDD: equivalence claims to other devices are tightly constrained, and post-market clinical follow-up (PMCF) feeds back into the CER.

Common pitfalls

•Failing to include a comprehensive search strategy for relevant clinical data can lead to an incomplete CER.
•Not adequately justifying equivalence claims to a predicate device is a common pitfall.
•Overlooking the continuous update requirement of the CER throughout the device lifecycle often results in non-compliance.
•Poorly documented or insufficient PMCF data can weaken the conclusions of the CER.
•Presenting a CER as a static document, rather than one that evolves with new clinical data, is a frequent mistake.

Sources

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Why compare MedTech terms side by side?

MedTech terminology is full of pairs that look interchangeable but carry very different regulatory, clinical, and commercial consequences. Picking the wrong framework, pathway, or standard early in a project can add months to a submission, invalidate clinical evidence, or trigger an audit finding. Side-by-side comparison is the fastest way to surface those differences before they become costly mistakes.

Each comparison on this page pulls from the same vendor-neutral, sourced definitions used throughout the MedTech Terms glossary. You see the one-line summary, the formal definition, why it matters in practice, common pitfalls, and the primary sources (FDA guidance, EU MDR/IVDR articles, ISO/IEC standards, MDCG documents, IMDRF principles) that back each entry. That makes the comparison defensible in regulatory strategy memos, design reviews, and submission narratives.

Common comparison patterns

Regulatory pathway choice - 510(k) vs PMA, 510(k) vs De Novo, Abbreviated vs Special 510(k).
Quality systems - QSR vs ISO 13485, QMSR vs QSR.
Software classification - SaMD vs SiMD, Locked vs adaptive AI.
EU frameworks - MDR vs IVDR, CE Mark vs UKCA.
Cybersecurity artifacts - SPDX vs CycloneDX SBOM, CVE vs CVSS.
Post-market actions - Recall vs field action, Removal vs correction.

How to use this tool

Pick term A and term B from the dropdowns, or click a preset above. The URL updates with both slugs so you can bookmark or share the exact comparison with a colleague, a notified body reviewer, or your regulatory consultant. Click Open full page on either side for the complete entry, including FAQs, related terms, and the full citation list. If you are not sure which term to start with, browse the Categories view or the A-Z index.

MedTech Terms is a vendor-neutral community resource sponsored by Blue Goat Cyber. Definitions are written for educational use and are not legal or regulatory advice.