Under the EU Medical Device Regulation, manufacturers must provide documented evidence showing that their device achieves its intended purpose while maintaining an acceptable benefit-risk profile.
The primary document used to demonstrate this evidence is the Clinical Evaluation Report (CER).
The requirement for clinical evaluation is defined in Article 61 and Annex XIV of the EU MDR Regulation (EU) 2017/745, which require manufacturers to plan, conduct, and document a clinical evaluation throughout the device lifecycle. The regulation can be reviewed in full through the official EU legal text for the EU MDR Regulation (EU) 2017/745.
The clinical evaluation process analyses clinical data to confirm that a device meets the General Safety and Performance Requirements (GSPRs) and that the benefits of the device outweigh the associated risks.
For manufacturers seeking CE marking, a well-structured CER is essential for regulatory submissions and Notified Body review.
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What is a Clinical Evaluation Report?
A Clinical Evaluation Report (CER) is the documented assessment of clinical data used to verify the safety, performance, and clinical benefit of a medical device.
The concept and methodology are described in MDCG 2020-13, the European Commission guidance on clinical evaluation assessment. This guidance can be accessed through the European Commission medical device guidance portal on the MDCG guidance documents page.
The CER brings together multiple sources of clinical evidence, including:
- clinical investigation data
- published scientific literature
- equivalent device data
- post-market surveillance information
The purpose of the CER is to determine whether sufficient clinical evidence exists to support regulatory approval.
Why clinical evaluation is required under EU MDR
The EU MDR strengthened clinical evidence requirements compared to the previous Medical Device Directive.
Under Article 61 of the EU MDR, manufacturers must perform a clinical evaluation to demonstrate conformity with the General Safety and Performance Requirements. The legal requirements are detailed in the EU MDR regulation available through the official EU MDR legal text.
Clinical evaluation serves several critical purposes:
- verifying device safety and performance
- confirming the benefit-risk balance
- supporting regulatory submissions and CE marking
- identifying knowledge gaps that require clinical investigation
Notified Bodies review the CER during conformity assessments to ensure the device has adequate clinical evidence.
Clinical evaluation plan and process
Clinical evaluation begins with a Clinical Evaluation Plan (CEP), which defines the methodology used to collect and analyse clinical data.
Annex XIV of the EU MDR outlines the key steps of the clinical evaluation process:
- Identification of relevant clinical data
- Critical appraisal of data quality and relevance
- Analysis of clinical evidence
- Documentation of conclusions in the CER
These steps form a continuous process that must be maintained throughout the device lifecycle.
Manufacturers must ensure that the evaluation methodology is scientifically valid and aligned with regulatory expectations.
Sources of clinical evidence
A CER typically draws on several types of clinical evidence.
Clinical investigations
Clinical investigations provide direct evidence of device safety and performance in human subjects.
The EU MDR outlines clinical investigation requirements in Articles 62 to 82, covering study design, ethics approvals, and regulatory reporting.
Clinical investigations are particularly important for high-risk devices and innovative technologies.
Scientific literature
Published scientific literature can also support clinical evaluation.
Literature reviews must be systematic, reproducible, and relevant to the device being evaluated.
Manufacturers must demonstrate that the literature data relates to devices with equivalent design, intended use, and technological characteristics.
Equivalent device data
In some cases, manufacturers may rely on data from equivalent devices.
However, the EU MDR significantly tightened equivalence requirements. Manufacturers must demonstrate:
- technical equivalence
- biological equivalence
- clinical equivalence
Access to the equivalent device’s technical documentation may also be required.
Post-market clinical data
Clinical evaluation does not end once the device is approved.
Post-market surveillance activities such as complaint monitoring, vigilance reporting, and post-market clinical follow-up studies provide valuable data that should be incorporated into the CER.
Structure of a Clinical Evaluation Report
A well-structured CER typically includes several key sections.
These may include:
- device description and intended use
- regulatory and clinical background
- clinical evaluation methodology
- literature search and appraisal
- analysis of clinical data
- benefit-risk evaluation
- conclusions regarding safety and performance
The CER should demonstrate clear traceability between clinical evidence, risk management, and the device’s intended purpose.
Integration with risk management
Clinical evaluation and risk management are closely connected.
The medical device risk management standard ISO 14971 requires manufacturers to identify hazards, estimate risks, and implement controls throughout the device lifecycle.
Clinical evidence helps confirm whether these risk control measures are effective in real-world use.
For example, clinical data may reveal unexpected adverse events or demonstrate improved outcomes that influence the benefit-risk balance.
The ISO risk management framework can be explored through the official overview of ISO 14971:2019.
Integrating clinical evaluation with risk management ensures that safety decisions are supported by evidence.
Maintaining the CER throughout the lifecycle
Under the EU MDR, the CER must be updated throughout the device lifecycle.
This ongoing evaluation ensures that new clinical data continues to support device safety and performance.
Sources of post-market data that may influence CER updates include:
- post-market surveillance reports
- clinical investigations
- scientific literature updates
- complaint and vigilance data
- post-market clinical follow-up studies
Regular updates ensure that the CER remains aligned with the device’s real-world performance.
Common CER preparation challenges
Many manufacturers struggle to meet the stricter EU MDR clinical evidence expectations.
Common challenges include:
- insufficient clinical data
- incomplete literature reviews
- weak equivalence justifications
- poor traceability between CER and risk management documentation
- outdated CER updates
These issues frequently arise during Notified Body reviews.
Practical steps for CER preparation
Manufacturers preparing a Clinical Evaluation Report should follow a structured approach.
Recommended steps include:
- Develop a Clinical Evaluation Plan.
- Conduct a systematic literature review.
- Collect clinical investigation and post-market data.
- Evaluate clinical evidence quality and relevance.
- Analyse the benefit-risk balance.
- Document findings within the CER.
- Maintain updates throughout the device lifecycle.
Following this process helps ensure the CER remains compliant with EU MDR expectations.
How Patient Guard supports clinical evaluation
Preparing a compliant CER requires both regulatory expertise and a strong understanding of clinical evidence.
Patient Guard supports manufacturers with:
- clinical evaluation strategy development
- CER writing and review
- cCreation of the state of the art literature report
- systematic literature searches
- integration with risk management and PMS systems
- Notified Body submission preparation
This structured support helps ensure that clinical evidence aligns with EU MDR regulatory expectations.
Summing up
The Clinical Evaluation Report is one of the most critical documents supporting EU MDR compliance.
By systematically analysing clinical evidence, manufacturers can demonstrate that their devices meet safety and performance requirements and maintain a positive benefit-risk profile.
Regulations such as the EU MDR Regulation (EU) 2017/745 emphasise that clinical evaluation must be maintained throughout the device lifecycle.
When properly integrated with risk management and post-market surveillance, the CER becomes a powerful tool for demonstrating regulatory compliance and supporting patient safety.
Book a consultation with Patient Guard to strengthen your clinical evaluation strategy.
FAQ
A Clinical Evaluation Report is the documented assessment of clinical evidence used to demonstrate the safety and performance of a medical device under EU MDR.
Yes. EU MDR requires manufacturers to perform clinical evaluation for all devices, although the level of evidence required may vary depending on device risk class.
CER updates depend on device classification and post-market data. Higher-risk devices require more frequent updates.
Clinical investigations, scientific literature, equivalent device data, and post-market surveillance information may all contribute to clinical evaluation.
Clinical data helps verify that risk control measures are effective and that the benefit-risk balance of the device remains acceptable throughout its lifecycle.
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