[Home](/)/[Resources](/resources)/UK Medical Device Clinical Evaluation Medical DevicesClinical EvaluationMHRA # UK Medical Device Clinical Evaluation: MHRA Requirements and Post-Brexit Changes Clinical evaluation is the systematic process of gathering and appraising clinical data to verify that a medical device achieves its intended purpose and has an acceptable benefit-risk profile. For the UK market, clinical evaluation must satisfy MHRA under the UK MDR 2002 framework — which diverges from EU MDR in key respects including the continuing validity of the equivalence approach and MHRA's specific guidance documents. Copy Link[Share on WhatsApp](https://wa.me/?text=https%3A%2F%2Fkrono-labs.com%2Fguides%2Fuk-medical-device-clinical-evaluation) ## Clinical evaluation stages 01 ### Stage 1: Identify applicable regulations and device classification Confirm the device is a medical device under UK MDR 2002 (as amended). Determine device class (Class I, IIa, IIb, III) — class drives the depth of clinical evidence required and whether UK Approved Body review is needed. 02 ### Stage 2: Define intended purpose and clinical claims Document the intended purpose precisely — clinical evaluation must cover all intended uses, indications, patient populations, and body parts. Unsubstantiated clinical claims are a primary MHRA finding. 03 ### Stage 3: Literature review Systematic literature search for clinical data on the device (or equivalent/similar devices). Literature must be searched in recognised databases (MEDLINE/PubMed, EMBASE, Cochrane) with a documented search strategy and selection criteria. 04 ### Stage 4: Clinical data appraisal Evaluate the clinical relevance, scientific validity, and quality of each data source. Weight of evidence assessment — randomised controlled trials have higher weight than case series. 05 ### Stage 5: Clinical evaluation report (CER) Compile a clinical evaluation report documenting the evaluation process, data reviewed, conclusions on safety and performance, benefit-risk analysis, and residual risks. The CER must be signed by a clinically qualified and technically competent evaluator. 06 ### Stage 6: Post-market clinical follow-up (PMCF) Proactive plan to collect clinical data after market launch to confirm safety and performance and identify emerging risks. PMCF plan and reports are required for Class IIa, IIb, and III devices. ## UK vs EU clinical evaluation: key differences AspectUK (MHRA)EU (MDR) Applicable regulationUK MDR 2002 as amended; MHRA guidance documentsEU MDR (Regulation (EU) 2017/745) MEDDEV applicabilityMEDDEV 2.7/1 Rev 4 approach is accepted by MHRA as best practice for clinical evaluation methodologyMEDCOG MDCG 2020-6 clinical evidence guidance; MDR Annex XIV requirements Clinical investigation requirementsMHRA approval required for clinical investigations of medical devices in the UKEUDAMED registration and EU member state approval required Equivalence approachEquivalence to a predicate device remains a legitimate clinical evaluation approach under UK MDR, subject to demonstrating sufficient equivalence in clinical, technical, and biological characteristicsEU MDR significantly tightened equivalence — contract access to equivalent device's technical documentation often required ## Learn this properly, not just for one product In-depth courses and books that teach the process — not a one-off answer you'll need to look up again next time. [Start the course — $149](/courses/09-ukca-marking-for-electronics-products)See your free roadmap [Prefer to read? Get the book — $24.99](/books/09-ukca-marking-for-electronics-products) ## Frequently asked questions ### Does the UK accept clinical data generated from EU MDR clinical investigations? Yes. Clinical data from studies conducted in EU member states that are appropriately designed and reported can be included in UK clinical evaluations. The clinical data itself (patient outcomes, safety data) is not jurisdiction-specific — it is the regulatory framework that differs. EU-conducted clinical investigations under EU MDR are generally acceptable data inputs for UK MHRA clinical evaluation reviews, provided the studies are methodologically sound. ### How does MHRA assess clinical evaluation reports during UK Approved Body review? For Class IIb and III devices, the UK Approved Body reviews the clinical evaluation report as part of the conformity assessment. The Approved Body examines: whether the systematic literature search is methodologically adequate; whether the clinical data substantiates the claimed intended purpose; whether the benefit-risk conclusion is credible and supported by data; and whether the PMCF plan is proportionate to the residual risks. MHRA may also conduct direct scientific advisory or review functions for certain device categories. 🇬🇧 UK roadmap for medical devices Every standard, document, and test that applies — free, no account required. See your free roadmap[ Want an expert to take medical devices through 🇬🇧 UK compliance for you? One consultant from Krono's compliance team takes your product from requirements to legal sale, with a fixed quote before any work starts. See compliance services](/services) Learn this properly In-depth course that teaches the full process, not just this one answer. [Start the course — $149](/courses/09-ukca-marking-for-electronics-products)[Prefer to read? Get the book — $24.99](/books/09-ukca-marking-for-electronics-products) Related guides * [UK In-Vitro Diagnostic DevicesComplete guide to UK In-Vitro Diagnostic Medical Device Regulations 2022 for Great Britain: IVDR classification (A, B, C, D), M…](/guides/uk-medical-devices-ivd) * [Software as a Medical Device (SaMD) UKComplete guide to Software as a Medical Device (SaMD) in the UK: MHRA classification framework, when software qualifies as a me…](/guides/uk-software-medical-device) * [UK Approved Body vs EU Notified BodyComplete guide to UK Approved Bodies vs EU Notified Bodies: what changed after Brexit, which products require third-party asses…](/guides/uk-approved-body-vs-notified-body) * [CE to UKCA Transition GuideStep-by-step guide to transitioning from CE marking to UKCA marking for the Great Britain market: what changes, what stays the …](/guides/ce-to-ukca-transition) Educational resource only. MHRA medical device regulations and guidance are updated regularly. Always verify current clinical evaluation requirements on the MHRA website before preparing documentation.