The BEP is the plan before the work. The BER is the report after the work.
In ISO 10993 terms, the BEP defines how biological evaluation will be approached for the device, while the BER documents the evidence reviewed, the endpoint-by-endpoint conclusions, and the final biological safety determination. They are related, but they are not interchangeable. The free BEP–BER evidence traceability diagnostic checks whether the plan-to-report links remain intact.
These two documents are consistently confused in submissions. That confusion matters because reviewers do not just want evidence that a device is biologically safe. They also want to see that the evaluation was planned properly before the conclusions were written.
BEP and BER: Why the Confusion Exists
ISO 10993-1 requires biological evaluation to be planned and documented. Teams commonly use a distinct Biological Evaluation Plan (BEP) and Biological Evaluation Report (BER) to preserve that prospective-to-final traceability, although the submission format can vary by pathway. When the planning logic and final assessment are blurred, reviewers may be unable to see whether the evidence strategy was established prospectively or reconstructed after the results were known.
The BEP: Biological Evaluation Plan
The BEP is established before conclusions are finalized and before any new evaluation work is commissioned. It is the planning document that defines the biological evaluation strategy for the device.
What the BEP should include
- Device description: patient-contacting materials, contact type, contact duration, intended use, and relevant patient population.
- Endpoint identification: which ISO 10993-1 endpoints apply to the device and why.
- Evaluation strategy: how each endpoint will be addressed through existing data, literature, chemistry, or new testing.
- Waiver planning: which endpoints are expected to be waived and the scientific basis that will need to support that approach.
- Applicable frameworks: the relevant ISO 10993 subparts, FDA guidance, EU MDR context, and internal risk-management alignment.
The BEP is the document that says: this is how the device will be evaluated. It should be reviewed and approved before the biological evaluation is executed, not written afterward as an administrative formality.
The BER: Biological Evaluation Report
The BER is written after the biological evaluation is complete. It is the scientific report that presents the evidence reviewed and the conclusions reached for the finished device.
What the BER should include
- Evidence reviewed: literature, existing biocompatibility data, material information, chemistry data, and any relevant equivalence arguments.
- Test results and interpretation: where biological testing was performed, the report must explain the relevance of those results to the actual device.
- Waiver justifications: the real scientific argument for endpoints that were not tested.
- Endpoint-by-endpoint conclusions: whether each applicable biological risk has been adequately addressed.
- Overall biological safety conclusion: whether the device is biologically safe for its intended use, based on the evidence assessed.
The BER is the document that says: this is the evidence, this is how it was interpreted, and this is the conclusion.
Quick Comparison: BEP vs BER
- Timing: the BEP comes first; the BER comes after the evaluation is completed.
- Purpose: the BEP defines the strategy; the BER documents the evidence and conclusions.
- Tone: the BEP is prospective; the BER is analytical and retrospective.
- Regulatory value: the BEP shows the evaluation was planned appropriately, while the BER shows whether the final safety position is defensible.
The Single Most Common Mistake
The most common mistake is presenting a final BER without traceable evidence of prospective planning, or using one combined record that does not clearly distinguish the approved plan from the completed assessment. Under EU MDR and current ISO 10993 expectations, reviewers need to see that the evaluation strategy was established before conclusions were finalized and before any new work was commissioned. Without that traceability, the evaluation can look reverse-engineered to support a predetermined conclusion.
What Reviewers Expect to See
Strong submissions make the logic visible. The reviewer should be able to follow the thread from device materials and contact classification, to the planned endpoint strategy in the BEP, to the evidence review and final conclusions in the BER. When that sequence is missing, even good science can look weak.
Establish and approve the plan before commissioning new evaluation work or finalizing conclusions. Then document the completed evaluation in the BER or equivalent final record. The important control is a traceable progression from prospective strategy to evidence-based conclusion.
Key References
- ISO 10993-1 expectations for planning and reporting within a biological evaluation process
- FDA and EU MDR reviewer focus on document sequence, endpoint rationale, and finished-device logic
- ISO 14971 alignment where biological risk decisions are planned before conclusions are written
- Submission patterns where weak separation between BEP and BER creates avoidable reviewer friction
Why this perspective is practical
Arvind Rathore is the founder of MedDev Advisory, where his work focuses on ISO 10993 biological-evaluation strategy and documentation. Before establishing the practice, he was a Marie Skłodowska-Curie Early Stage Researcher at INSERM U1026 Biotis within the ImplantSens network. His research covered implantable electrochemical biosensors, cytotoxicity, oxidative stress, sterilization effects and biomaterial–cell interactions, with research placements in France, Germany and Sweden. Peer-reviewed work in Bioelectrochemistry and Advanced Sensor Research also informs his evidence-led approach. Read more about Arvind Rathore.
Need help with your BEP, BER, or an existing draft that needs a specialist check?
Read the full plan-to-report lifecycle in The Biological Evaluation Strategy Handbook, or choose drafting or review support for a specific BEP or BER.